N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride

C117H182Cl5N19O28 — CID 163679594

About N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride

N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride (PubChem CID 163679594) has the molecular formula C117H182Cl5N19O28 and a molecular weight of 2480.11 g/mol. Its IUPAC name is N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride.

Molecular Properties

• Compound Name: N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride
• PubChem CID: 163679594
• Molecular Formula: C117H182Cl5N19O28
• Molecular Weight: 2480.11 g/mol
• Exact Mass: 2476.18
• IUPAC Name: N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride
• SMILES: C.CC(C)(C)C[C@H](NC(=O)OC(C)(C)C)C(=O)O.CC(C)(C)C[C@H](NC(=O)c1cc2cccc(Cl)c2[nH]1)C(=O)N[C@@H](C[C@@H]1CCCNC1=O)C(N)=O.COC(=O)[C@@H](N)C[C@@H]1CCCNC1=O.COC(=O)[C@H](C[C@@H]1CCCNC1=O)NC(=O)[C@@H](N)CC(C)(C)C.COC(=O)[C@H](C[C@@H]1CCCNC1=O)NC(=O)[C@H](CC(C)(C)C)NC(=O)OC(C)(C)C.COC(=O)[C@H](C[C@@H]1CCCNC1=O)NC(=O)[C@H](CC(C)(C)C)NC(=O)c1cc2cccc(Cl)c2[nH]1.Cl.Cl.O=C(O)c1cc2cccc(Cl)c2[nH]1
• InChI: InChI=1S/C25H33ClN4O5.C24H32ClN5O4.C21H37N3O6.C16H29N3O4.C12H23NO4.C9H6ClNO2.C9H16N2O3.CH4.2ClH/c1-25(2,3)13-19(30-22(32)17-11-14-7-5-9-16(26)20(14)28-17)23(33)29-18(24(34)35-4)12-15-8-6-10-27-21(15)31;1-24(2,3)12-18(30-22(33)17-10-13-6-4-8-15(25)19(13)28-17)23(34)29-16(20(26)31)11-14-7-5-9-27-21(14)32;1-20(2,3)12-15(24-19(28)30-21(4,5)6)17(26)23-14(18(27)29-7)11-13-9-8-10-22-16(13)25;1-16(2,3)9-11(17)14(21)19-12(15(22)23-4)8-10-6-5-7-18-13(10)20;1-11(2,3)7-8(9(14)15)13-10(16)17-12(4,5)6;10-6-3-1-2-5-4-7(9(12)13)11-8(5)6;1-14-9(13)7(10)5-6-3-2-4-11-8(6)12;;;/h5,7,9,11,15,18-19,28H,6,8,10,12-13H2,1-4H3,(H,27,31)(H,29,33)(H,30,32);4,6,8,10,14,16,18,28H,5,7,9,11-12H2,1-3H3,(H2,26,31)(H,27,32)(H,29,34)(H,30,33);13-15H,8-12H2,1-7H3,(H,22,25)(H,23,26)(H,24,28);10-12H,5-9,17H2,1-4H3,(H,18,20)(H,19,21);8H,7H2,1-6H3,(H,13,16)(H,14,15);1-4,11H,(H,12,13);6-7H,2-5,10H2,1H3,(H,11,12);1H4;2*1H/t15-,18-,19-;14-,16-,18-;13-,14-,15-;10-,11-,12-;8-;;6-,7-;;;/m00000.0.../s1
• InChIKey: QAMFNYYWUKJMCK-AWSKKGMMSA-N
• XLogP: 13.19
• TPSA: 719.06 Ų
• H-Bond Donors: 21
• H-Bond Acceptors: 28
• Rotatable Bonds: 36
• Heavy Atoms: 169
• Complexity: —

Lipinski Rule of Five

4 violations

Rule	Value
MW ≤ 500	2480.11
LogP ≤ 5	13.19
H-Bond Donors ≤ 5	21
H-Bond Acceptors ≤ 10	28

Computed Properties (RDKit)

• Structural Alerts: {'alert_name': '>_2_ester_groups', 'substructure': 'N/A'}

Frequently Asked Questions

What is the IUPAC name of N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride?

The IUPAC name of N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride (CID 163679594) is N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride.

What is the SMILES notation for N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride?

The canonical SMILES for N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride is C.CC(C)(C)C[C@H](NC(=O)OC(C)(C)C)C(=O)O.CC(C)(C)C[C@H](NC(=O)c1cc2cccc(Cl)c2[nH]1)C(=O)N[C@@H](C[C@@H]1CCCNC1=O)C(N)=O.COC(=O)[C@@H](N)C[C@@H]1CCCNC1=O.COC(=O)[C@H](C[C@@H]1CCCNC1=O)NC(=O)[C@@H](N)CC(C)(C)C.COC(=O)[C@H](C[C@@H]1CCCNC1=O)NC(=O)[C@H](CC(C)(C)C)NC(=O)OC(C)(C)C.COC(=O)[C@H](C[C@@H]1CCCNC1=O)NC(=O)[C@H](CC(C)(C)C)NC(=O)c1cc2cccc(Cl)c2[nH]1.Cl.Cl.O=C(O)c1cc2cccc(Cl)c2[nH]1.

What is the InChIKey of N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride?

The InChIKey is QAMFNYYWUKJMCK-AWSKKGMMSA-N. The full InChI is InChI=1S/C25H33ClN4O5.C24H32ClN5O4.C21H37N3O6.C16H29N3O4.C12H23NO4.C9H6ClNO2.C9H16N2O3.CH4.2ClH/c1-25(2,3)13-19(30-22(32)17-11-14-7-5-9-16(26)20(14)28-17)23(33)29-18(24(34)35-4)12-15-8-6-10-27-21(15)31;1-24(2,3)12-18(30-22(33)17-10-13-6-4-8-15(25)19(13)28-17)23(34)29-16(20(26)31)11-14-7-5-9-27-21(14)32;1-20(2,3)12-15(24-19(28)30-21(4,5)6)17(26)23-14(18(27)29-7)11-13-9-8-10-22-16(13)25;1-16(2,3)9-11(17)14(21)19-12(15(22)23-4)8-10-6-5-7-18-13(10)20;1-11(2,3)7-8(9(14)15)13-10(16)17-12(4,5)6;10-6-3-1-2-5-4-7(9(12)13)11-8(5)6;1-14-9(13)7(10)5-6-3-2-4-11-8(6)12;;;/h5,7,9,11,15,18-19,28H,6,8,10,12-13H2,1-4H3,(H,27,31)(H,29,33)(H,30,32);4,6,8,10,14,16,18,28H,5,7,9,11-12H2,1-3H3,(H2,26,31)(H,27,32)(H,29,34)(H,30,33);13-15H,8-12H2,1-7H3,(H,22,25)(H,23,26)(H,24,28);10-12H,5-9,17H2,1-4H3,(H,18,20)(H,19,21);8H,7H2,1-6H3,(H,13,16)(H,14,15);1-4,11H,(H,12,13);6-7H,2-5,10H2,1H3,(H,11,12);1H4;2*1H/t15-,18-,19-;14-,16-,18-;13-,14-,15-;10-,11-,12-;8-;;6-,7-;;;/m00000.0.../s1.

What are the key properties of N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride?

N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride has a molecular weight of 2480.11 g/mol, XLogP of 13.19, 36 rotatable bonds, 21 hydrogen bond donors, and 28 hydrogen bond acceptors.

Where does this data come from?

All data for N-[(2S)-1-[[(2S)-1-amino-1-oxo-3-[(3S)-2-oxopiperidin-3-yl]propan-2-yl]amino]-4,4-dimethyl-1-oxopentan-2-yl]-7-chloro-1H-indole-2-carboxamide;7-chloro-1H-indole-2-carboxylic acid;(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoic acid;methane;methyl (2S)-2-[[(2S)-2-amino-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-amino-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-2-[(7-chloro-1H-indole-2-carbonyl)amino]-4,4-dimethylpentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;methyl (2S)-2-[[(2S)-4,4-dimethyl-2-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyl]amino]-3-[(3S)-2-oxopiperidin-3-yl]propanoate;dihydrochloride is sourced from PubChem (CID 163679594), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).