Chembase list of 866358 unique molecular structures

2-methyl-1-(pyrrolidine-2-carbonyl)-2,3-dihydro-1H-indole

$$$$ Data

M. F.

C14H18N2O

Suppliers	Catalog Number
Matrix Scientific	020474

Database	Data ID
PubChem	24206717

M. W.

230.30552

CAS

Similarity

N/A

ID: 18352

2-chloro-1-(1-methyl-1H-pyrrol-3-yl)ethan-1-one

$$$$ Data

M. F.

C7H8ClNO

Suppliers	Catalog Number
Matrix Scientific	020475
Enamine	EN300-10370

Database	Data ID
PubChem	2513402

M. W.

157.59752

CAS

126624-55-3

Similarity

N/A

ID: 18353

4-(2-hydroxyethoxy)benzaldehyde

$$$$ Data

M. F.

C9H10O3

Suppliers	Catalog Number
Matrix Scientific	020476

Database	Data ID
PubChem	89178

M. W.

166.1739

CAS

22042-73-5

Similarity

N/A

ID: 18354

(2-methoxyphenyl)hydrazine

$$$$ Data

M. F.

C7H10N2O

Suppliers	Catalog Number
Matrix Scientific	020477
Life Chemicals	F2147-0628

Database	Data ID
PubChem	415063

M. W.

138.1671

CAS

18312-46-4

Similarity

N/A

ID: 18355

5-(3,5-dimethoxyphenyl)-1,3,4-thiadiazol-2-amine

$$$$ Data

M. F.

C10H11N3O2S

Suppliers	Catalog Number
Matrix Scientific	020478

Database	Data ID
PubChem	3737342

M. W.

237.27824

CAS

Similarity

N/A

ID: 18356

4-(5-chloro-2-methoxyphenyl)-1,3-thiazol-2-amine

$$$$ Data

M. F.

C10H9ClN2OS

Suppliers	Catalog Number
Matrix Scientific	020479

Database	Data ID
PubChem	2063560

M. W.

240.70926

CAS

303019-72-9

Similarity

N/A

ID: 18357

2-(2-methoxy-5-methylphenyl)acetic acid

$$$$ Data

M. F.

C10H12O3

Suppliers	Catalog Number
Matrix Scientific	020480
Enamine	EN300-13796
A&J Pharmtech	AJA-O5059

Database	Data ID
PubChem	232537

M. W.

180.20048

CAS

58506-24-4

Similarity

N/A

ID: 18358

4-[2-(dimethylamino)ethoxy]aniline

$$$$ Data More

M. F.

C10H16N2O

Suppliers	Catalog Number
Matrix Scientific	020481
Maybridge	CC51514
Apollo Scientific	OR8695

Database	Data ID
PubChem	6484655

M. W.

180.24684

CAS

62345-76-0

Similarity

N/A

ID: 18359

2-[2-(dimethylamino)ethoxy]benzoic acid

$$$$ Data

M. F.

C11H15NO3

Suppliers	Catalog Number
Matrix Scientific	020482
Maybridge	CC51301
Apollo Scientific	OR8666

Database	Data ID
PubChem	6484659

M. W.

209.2417

CAS

206261-66-7

Similarity

N/A

ID: 18360

4-(thiophen-2-ylmethoxy)benzaldehyde

$$$$ Data

M. F.

C12H10O2S

Suppliers	Catalog Number
Matrix Scientific	020483

Database	Data ID
PubChem	2984950

M. W.

218.2716

CAS

Similarity

N/A

ID: 18361

3-(thiophen-2-ylmethoxy)benzaldehyde

$$$$ Data

M. F.

C12H10O2S

Suppliers	Catalog Number
Matrix Scientific	020484

Database	Data ID
PubChem	6484667

M. W.

218.2716

CAS

Similarity

N/A

ID: 18362

3-(4-chlorobenzenesulfonyl)propanoic acid

$$$$ Data More

M. F.

C9H9ClO4S

Suppliers	Catalog Number
Matrix Scientific	020487
Life Chemicals	F1900-0033
InterBioScreen	BB_SC-3388

Database	Data ID
PubChem	573910

M. W.

248.68336

CAS

90396-00-2

Similarity

N/A

ID: 18363

4-[(4-fluorophenyl)methoxy]benzoic acid

$$$$ Data

M. F.

C14H11FO3

Suppliers	Catalog Number
Matrix Scientific	020489

Database	Data ID
PubChem	961595

M. W.

246.2337432

CAS

Similarity

N/A

ID: 18364

3-[(4-fluorophenyl)methoxy]benzoic acid

$$$$ Data

M. F.

C14H11FO3

Suppliers	Catalog Number
Matrix Scientific	020490
Enamine	EN300-12990

Database	Data ID
PubChem	964403

M. W.

246.2337432

CAS

457-97-6

Similarity

N/A

ID: 18365

1-ethyl-2,3-dimethyl-1H-indol-5-amine

$$$$ Data

M. F.

C12H16N2

Suppliers	Catalog Number
Matrix Scientific	020491

Database	Data ID
PubChem	6485309

M. W.

188.26884

CAS

Similarity

N/A

ID: 18366

2-[(4-aminophenyl)(2-hydroxyethyl)amino]ethan-1-ol

$$$$ Data

M. F.

C10H16N2O2

Suppliers	Catalog Number
Matrix Scientific	020492

Database	Data ID
PubChem	82057

M. W.

196.24624

CAS

Similarity

N/A

ID: 18367

2-(2-chloroacetamido)-N,N,4-trimethyl-1,3-thiazole-5-carboxamide

$$$$ Data

M. F.

C9H12ClN3O2S

Suppliers	Catalog Number
Matrix Scientific	020493

Database	Data ID
PubChem	3415575

M. W.

261.72848

CAS

Similarity

N/A

ID: 18368

1-ethyl-1H-pyrazol-3-amine

$$$$ Data

M. F.

C5H9N3

Suppliers	Catalog Number
ChemBridge	4031413
Matrix Scientific	020494

Database	Data ID
PubChem	12198109

M. W.

111.14506

CAS

55361-49-4

Similarity

N/A

ID: 18369

N-(3-aminophenyl)-1-ethyl-1H-pyrazole-5-carboxamide

$$$$ Data

M. F.

C12H14N4O

Suppliers	Catalog Number
Matrix Scientific	020495

Database	Data ID
PubChem	6485364

M. W.

230.26576

CAS

Similarity

N/A

ID: 18370

7-(furan-2-yl)pyrazolo[1,5-a]pyrimidine-3-carboxylic acid

$$$$ Data

M. F.

C11H7N3O3

Suppliers	Catalog Number
Matrix Scientific	020496
Enamine	EN300-92873

Database	Data ID
PubChem	6485365

M. W.

229.19158

CAS

Similarity

N/A

ID: 18371

4-amino-N,1-dimethyl-1H-pyrazole-5-carboxamide

$$$$ Data

M. F.

C6H10N4O

Suppliers	Catalog Number
ChemBridge	4029716
Matrix Scientific	020497

Database	Data ID
PubChem	6485370

M. W.

154.1698

CAS

957261-73-3

Similarity

N/A

ID: 18372

N-(3-aminophenyl)-1-ethyl-1H-pyrazole-3-carboxamide

$$$$ Data

M. F.

C12H14N4O

Suppliers	Catalog Number
Matrix Scientific	020498

Database	Data ID
PubChem	6485372

M. W.

230.26576

CAS

Similarity

N/A

ID: 18373

5-cyclopropyl-7-(trifluoromethyl)pyrazolo[1,5-a]pyrimidine-2-carbonyl chloride

$$$$ Data

M. F.

C11H7ClF3N3O

Suppliers	Catalog Number
Matrix Scientific	020499

Database	Data ID
PubChem	6485418

M. W.

289.6409896

CAS

Similarity

N/A

ID: 18374

6-fluoro-3-(piperidin-4-yl)-1,2-benzoxazole

$$$$ Data More

M. F.

C12H13FN2O

Suppliers	Catalog Number
Matrix Scientific	020500
Apollo Scientific	PC48296
TRC	F595830

Database	Data ID
PubChem	849421

M. W.

220.2428232

CAS

84163-77-9

Similarity

N/A

ID: 18375

1-(oxolan-2-ylmethoxy)propan-2-amine

$$$$ Data

M. F.

C8H17NO2

Suppliers	Catalog Number
Matrix Scientific	020501

Database	Data ID
PubChem	6485432

M. W.

159.22608

CAS

Similarity

N/A

ID: 18376

(2-methyl-2,3-dihydro-1-benzofuran-5-yl)methanamine

$$$$ Data

M. F.

C10H13NO

Suppliers	Catalog Number
ChemBridge	4017151
Matrix Scientific	020502

Database	Data ID
PubChem	6485437

M. W.

163.21632

CAS

55746-19-5

Similarity

N/A

ID: 18377

2-chloro-1-[1-(2-methoxyethyl)-2-methyl-1H-indol-3-yl]ethan-1-one

$$$$ Data

M. F.

C14H16ClNO2

Suppliers	Catalog Number
Matrix Scientific	020503

Database	Data ID
PubChem	6485439

M. W.

265.73534

CAS

Similarity

N/A

ID: 18378

2-chloro-1-[1-(2-methoxyethyl)-1H-indol-3-yl]ethan-1-one

$$$$ Data

M. F.

C13H14ClNO2

Suppliers	Catalog Number
Matrix Scientific	020504

Database	Data ID
PubChem	6485442

M. W.

251.70876

CAS

Similarity

N/A

ID: 18379

2-chloro-1-(6-fluoro-1H-indol-3-yl)ethan-1-one

$$$$ Data

M. F.

C10H7ClFNO

Suppliers	Catalog Number
Matrix Scientific	020505

Database	Data ID
PubChem	6485536

M. W.

211.6200832

CAS

Similarity

N/A

ID: 18380

3-(1-ethyl-2-methyl-1H-indol-3-yl)propanoic acid

$$$$ Data

M. F.

C14H17NO2

Suppliers	Catalog Number
Matrix Scientific	020506

Database	Data ID
PubChem	26188862

M. W.

231.29028

CAS

Similarity

N/A

ID: 18381

1-(4-methoxynaphthalen-1-yl)ethan-1-amine

$$$$ Data

M. F.

C13H15NO

Suppliers	Catalog Number
Matrix Scientific	020508

Database	Data ID
PubChem	5244129

M. W.

201.2643

CAS

Similarity

N/A

ID: 18382

4-(2-methoxyethoxy)benzoic acid

$$$$ Data

M. F.

C10H12O4

Suppliers	Catalog Number
Matrix Scientific	020509
Enamine	EN300-74449

Database	Data ID
PubChem	6485562

M. W.

196.19988

CAS

27890-92-2

Similarity

N/A

ID: 18383

2-{5-methyl-10,13-dioxa-4,6-diazatricyclo[7.4.0.0^{3,7}]trideca-1(9),2,5,7-tetra...

$$$$ Data

M. F.

C12H12N2O4

Suppliers	Catalog Number
Matrix Scientific	020510

Database	Data ID
PubChem	6485563

M. W.

248.23468

CAS

Similarity

N/A

ID: 18384

3-(pyridin-3-ylmethoxy)benzaldehyde

$$$$ Data

M. F.

C13H11NO2

Suppliers	Catalog Number
Matrix Scientific	020511
InterBioScreen	BB_SC-4888

Database	Data ID
PubChem	6485566

M. W.

213.23194

CAS

Similarity

N/A

ID: 18385

2-(pyridin-3-ylmethoxy)benzaldehyde

$$$$ Data

M. F.

C13H11NO2

Suppliers	Catalog Number
Matrix Scientific	020512
Enamine	EN300-31672

Database	Data ID
PubChem	6485567

M. W.

213.23194

CAS

Similarity

N/A

ID: 18386

1-(5-amino-1-ethyl-1H-1,3-benzodiazol-2-yl)ethan-1-ol

$$$$ Data

M. F.

C11H15N3O

Suppliers	Catalog Number
Matrix Scientific	020514

Database	Data ID
PubChem	6485575

M. W.

205.2563

CAS

Similarity

N/A

ID: 18387

1-ethyl-2-(propan-2-yl)-1H-1,3-benzodiazol-5-amine

$$$$ Data

M. F.

C12H17N3

Suppliers	Catalog Number
Matrix Scientific	020515

Database	Data ID
PubChem	6485576

M. W.

203.28348

CAS

Similarity

N/A

ID: 18388

2-[5-amino-2-(2-methylpropyl)-1H-1,3-benzodiazol-1-yl]ethan-1-ol

$$$$ Data

M. F.

C13H19N3O

Suppliers	Catalog Number
Matrix Scientific	020516

Database	Data ID
PubChem	6485577

M. W.

233.30946

CAS

Similarity

N/A

ID: 18389

(5-amino-1-ethyl-1H-1,3-benzodiazol-2-yl)methanol

$$$$ Data

M. F.

C10H13N3O

Suppliers	Catalog Number
Matrix Scientific	020517

Database	Data ID
PubChem	6485578

M. W.

191.22972

CAS

Similarity

N/A

ID: 18390

1,2-diethyl-1H-1,3-benzodiazol-5-amine

$$$$ Data

M. F.

C11H15N3

Suppliers	Catalog Number
ChemBridge	4029873
Matrix Scientific	020518

Database	Data ID
PubChem	6485579

M. W.

189.2569

CAS

Similarity

N/A

ID: 18391

3-(5-amino-1-ethyl-1H-1,3-benzodiazol-2-yl)propan-1-ol

$$$$ Data

M. F.

C12H17N3O

Suppliers	Catalog Number
Matrix Scientific	020519

Database	Data ID
PubChem	6485580

M. W.

219.28288

CAS

Similarity

N/A

ID: 18392

1-ethyl-1H-1,3-benzodiazol-5-amine

$$$$ Data

M. F.

C9H11N3

Suppliers	Catalog Number
ChemBridge	4031586
Matrix Scientific	020520

Database	Data ID
PubChem	1507595

M. W.

161.20374

CAS

62874-34-4

Similarity

N/A

ID: 18393

3-{3-[(diethylamino)methyl]-1H-indol-1-yl}propanoic acid

$$$$ Data

M. F.

C16H22N2O2

Suppliers	Catalog Number
Matrix Scientific	020521

Database	Data ID
PubChem	6485581

M. W.

274.35808

CAS

Similarity

N/A

ID: 18394

3-[3-(morpholin-4-ylmethyl)-1H-indol-1-yl]propanoic acid

$$$$ Data

M. F.

C16H20N2O3

Suppliers	Catalog Number
Matrix Scientific	020522

Database	Data ID
PubChem	6485582

M. W.

288.3416

CAS

Similarity

N/A

ID: 18395

3-[3-(pyrrolidin-1-ylmethyl)-1H-indol-1-yl]propanoic acid

$$$$ Data

M. F.

C16H20N2O2

Suppliers	Catalog Number
Matrix Scientific	020523

Database	Data ID
PubChem	6499098

M. W.

272.3422

CAS

Similarity

N/A

ID: 18396

3-chloro-4-[(1-methoxypropan-2-yl)oxy]aniline

$$$$ Data

M. F.

C10H14ClNO2

Suppliers	Catalog Number
Matrix Scientific	020524

Database	Data ID
PubChem	6485750

M. W.

215.67666

CAS

Similarity

N/A

ID: 18397

4-(morpholin-4-yl)-3-(trifluoromethyl)aniline

$$$$ Data

M. F.

C11H13F3N2O

Suppliers	Catalog Number
Matrix Scientific	020525

Database	Data ID
PubChem	2771329

M. W.

246.2289296

CAS

105316-06-1

Similarity

N/A

ID: 18398

3-(4-tert-butylphenyl)propanoic acid

$$$$ Data More

M. F.

C13H18O2

Suppliers	Catalog Number
Alfa Aesar	H54011
Matrix Scientific	020526
TRC	B690375

Database	Data ID
PubChem	4962173

M. W.

206.28082

CAS

1208-64-6

Similarity

N/A

ID: 18399

2-{[(2-fluorophenyl)methyl]sulfanyl}ethan-1-amine

$$$$ Data

M. F.

C9H12FNS

Suppliers	Catalog Number
Matrix Scientific	020527
Enamine	EN300-13079

Database	Data ID
PubChem	4962213

M. W.

185.2616832

CAS

Similarity

N/A

ID: 18400

2,5-dimethyl-1-(1,3-thiazol-2-yl)-1H-pyrrole-3-carbaldehyde

$$$$ Data

M. F.

C10H10N2OS

Suppliers	Catalog Number
Matrix Scientific	020528
InterBioScreen	BB_SC-4821
Enamine	EN300-13570

Database	Data ID
PubChem	4962515

M. W.

206.2642

CAS

Similarity

N/A

Part I: Carbon
- I.1: Carbon-Carbon Bonds
- I.1.1 Alkanes
- Primary carbon
- Secondary carbon
- Tertiary carbon
- Quaternary carbon
- I.1.2 C-C double and Triple Bonds
- Alkene
- Alkyne
- Allene
- I.2: One Carbon-Hetero Bond
- I.2.1 Alkyl Halogenides
- Alkylchloride
- Alkylfluoride
- Alkylbromide
- Alkyliodide
- I.2.2 Alcohols and Ethers
- Alcohol
- Primary alcohol
- Secondary alcohol
- Tertiary alcohol
- Dialkylether
- Dialkylthioether
- Alkylarylether
- Diarylether
- Alkylarylthioether
- Diarylthioether
- Oxonium
- I.2.3 Amines
- Amine
- Primary aliphatic amine
- Secondary aliphatic amine
- Tertiary aliphatic amine
- Quaternary aliphatic ammonium
- Primary aromatic amine
- Secondary aromatic amine
- Tertiary aromatic amine
- Quaternary aromatic ammonium
- Secondary mixed amine
- Tertiary mixed amine
- Quaternary mixed ammonium
- Ammonium
- I.2.4 Others
- Alkylthiol
- Dialkylthioether
- Alkylarylthioether
- Disulfide
- 1,2-Aminoalcohol
- 1,2-Diol
- 1,1-Diol
- Hydroperoxide
- Peroxo
- Organolithium compounds
- Organomagnesium compounds
- Organometallic compounds
- I.3: Two Carbon-Hetero Bonds (Carbonyl and Derivatives)
- I.3.1 Double Bond to Hetero
- Aldehyde
- Ketone
- Thioaldehyde
- Thioketone
- Imine
- Immonium
- Oxime
- Oximether
- I.3.2. Two Single Bonds to Hetero
- Acetal
- Hemiacetal
- Aminal
- Hemiaminal
- Thioacetal
- Thiohemiacetal
- Halogen acetal like
- Acetal like
- Halogenmethylen ester and similar
- NOS methylen ester and similar
- Hetero methylen ester and similar
- Cyanhydrine
- I.3.3 Single Bond to Hetero, C=C Double Bond (Enols and Similar)
- Chloroalkene
- Fluoroalkene
- Bromoalkene
- Iodoalkene
- Enol
- Endiol
- Enolether
- Enolester
- Enamine
- Thioenol
- Thioenolether
- I.4: Three Carbon-Hetero Bonds (Carboxyl and Derivatives)
- Acylchloride
- Acylfluoride
- Acylbromide
- Acyliodide
- Acylhalide
- Carboxylic acid
- Carboxylic ester
- Lactone
- Carboxylic anhydride
- Carboxylic acid derivative
- Carbothioic acid
- Carbothioic S ester
- Carbothioic S lactone
- Carbothioic O ester
- Carbothioic O lactone
- Carbothioic halide
- Carbodithioic acid
- Carbodithioic ester
- Carbodithiolactone
- Amide
- Primary amide
- Secondary amide
- Tertiary amide
- Lactam
- Alkyl imide
- N hetero imide
- Imide acidic
- Thioamide
- Thiolactam
- Oximester
- Amidine
- Hydroxamic acid
- Hydroxamic acid ester
- Imidoacid
- Imidoacid cyclic
- Imidoester
- Imidolactone
- Imidothioacid
- Imidothioacid cyclic
- Imidothioester
- Imidothiolactone
- Amidine
- Imidolactam
- Imidoylhalide
- Imidoylhalide cyclic
- Amidrazone
- Alpha aminoacid
- Alpha hydroxyacid
- Peptide middle
- Peptide C term
- Peptide N term
- Carboxylic orthoester
- Ketene
- Ketenacetal
- Nitrile
- Isonitrile
- Vinylogous carbonyl or carboxyl derivative
- Vinylogous acid
- Vinylogous ester
- Vinylogous amide
- Vinylogous halide
- I.5: Four Carbon-Hetero Bonds (Carbonic Acid and Derivatives)
- Carbonic acid dieester
- Carbonic acid esterhalide
- Carbonic acid monoester
- Carbonic acid derivatives
- Thiocarbonic acid dieester
- Thiocarbonic acid esterhalide
- Thiocarbonic acid monoester
- Urea
- Thiourea
- Isourea
- Isothiourea
- Guanidine
- Carbaminic acid
- Urethan(Carbamate ester)
- Biuret
- Semicarbazide
- Carbazide
- Semicarbazone
- Carbazone
- Thiosemicarbazide
- Thiocarbazide
- Thiosemicarbazone
- Thiocarbazone
- Isocyanate
- Cyanate
- Isothiocyanate
- Thiocyanate
- Carbodiimide
- Orthocarbonic derivatives
- I.6 Aromatics
- Phenol
- 1,2-Diphenol
- Arylchloride
- Arylfluoride
- Arylbromide
- Aryliodide
- Arylthiol
- Iminoarene
- Oxoarene
- Thioarene
- Hetero N basic H
- Hetero N basic no H
- Hetero N nonbasic
- Hetero O
- Hetero S
- Heteroaromatic
Part II: N, S, P, Si, B
- II.1 Nitrogen
- Nitrite
- Thionitrite
- Nitrate
- Nitro
- Nitroso
- Azide
- Acylazide
- Diazo
- Diazonium
- Nitrosamine
- Nitrosamide
- N-Oxide
- Hydrazine
- Hydrazone
- Hydroxylamine
- II.2 Sulfur
- Sulfon
- Sulfoxide
- Sulfonium
- Sulfuric acid
- Sulfuric monoester
- Sulfuric diester
- Sulfuric monoamide
- Sulfuric diamide
- Sulfuric esteramide
- Sulfuric derivative
- Sulfonic acid
- Sulfonamide
- Sulfonic ester
- Sulfonic halide
- Sulfonic derivative
- Sulfinic acid
- Sulfinic amide
- Sulfinic ester
- Sulfinic halide
- Sulfinic derivative
- Sulfenic acid
- Sulfenic amide
- Sulfenic ester
- Sulfenic halide
- Sulfenic derivative
- II.3 Phosphorous
- Phosphine
- Phosphine oxide
- Phosphonium
- Phosphorylen
- Phosphonic acid
- Phosphonic monoester
- Phosphonic diester
- Phosphonic monoamide
- Phosphonic diamide
- Phosphonic esteramide
- Phosphonic acid derivative
- Phosphoric acid
- Phosphoric monoester
- Phosphoric diester
- Phosphoric triester
- Phosphoric monoamide
- Phosphoric diamide
- Phosphoric triamide
- Phosphoric monoestermonoamide
- Phosphoric diestermonoamide
- Phosphoric monoesterdiamide
- Phosphoric acid derivative
- Phosphinic acid
- Phosphinic ester
- Phosphinic amide
- Phosphinic acid derivative
- Phosphonous acid
- Phosphonous monoester
- Phosphonous diester
- Phosphonous monoamide
- Phosphonous diamide
- Phosphonous esteramide
- Phosphonous derivatives
- Phosphinous acid
- Phosphinous ester
- Phosphinous amide
- Phosphinous derivatives
- II.4 Silicon
- Quart silane
- Non-quart silane
- Silylmonohalide
- Het trialkylsilane
- Dihet dialkylsilane
- Trihet alkylsilane
- Silicic acid derivative
- II.5 Boron
- Trialkylborane
- Boric acid derivatives
- Boronic acid derivative
- Borohydride
- Quaternary boron
Part III: Some Special Patterns
- III.1 Chains
- III.2 Rings
- Aromatic
- Heterocyclic
- Epoxide
- NH aziridine
- Spiro
- Annelated rings
- Bridged rings
- III.3 Sugars and Nucleosides/Nucleotides, Steroids
- Sugar pattern 1
- Sugar pattern 2
- Sugar pattern combi
- Sugar pattern 2 reducing
- Sugar pattern 2 alpha
- Sugar pattern 2 beta
- III.4 Everything else...
- Conjugated double bond
- Conjugated tripple bond
- Cis double bond
- Trans double bond
- Mixed anhydrides
- Halogen on hetero
- Halogen multi subst
- Trifluoromethyl
- C ONS bond
- Charged
- Anion
- Kation
- Salt
- 1,3-Tautomerizable
- 1,5-Tautomerizable
- Rotatable bond
- Michael acceptor
- Dicarbodiazene
- CH-acidic
- CH-acidic strong
- Chiral center specified