(2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one

C149H153ClF3N25O15 — CID 159224185

About (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one

(2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one (PubChem CID 159224185) has the molecular formula C149H153ClF3N25O15 and a molecular weight of 2626.47 g/mol. Its IUPAC name is (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one.

Molecular Properties

• Compound Name: (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one
• PubChem CID: 159224185
• Molecular Formula: C149H153ClF3N25O15
• Molecular Weight: 2626.47 g/mol
• Exact Mass: 2624.16
• IUPAC Name: (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one
• SMILES: CN(C)c1cccc(C(=O)N2CCn3nc(OCc4ccccc4)cc3C2)n1.CO[C@](C(=O)N1CCn2nc(OCc3ccccc3)cc2C1)(c1ccccc1)C(F)(F)F.Cc1ccc(C(=O)N2CCCn3nc(OCc4ccccc4)cc3C2)n1C.Cc1ccc(C(=O)N2CCCn3nc(OCc4ccncc4)cc3C2)cc1.Cc1ccc(C(=O)N2CCn3nc(OCc4ccccc4)cc3C2)cc1C.Cc1cccc(C(=O)N2CCn3nc(OCc4ccccc4)cc3C2)c1.O=C(c1ccccc1Cl)N1CCn2nc(OCc3ccccc3)cc2C1
• InChI: InChI=1S/C23H22F3N3O3.C22H23N3O2.C21H23N5O2.C21H22N4O2.C21H24N4O2.C21H21N3O2.C20H18ClN3O2/c1-31-22(23(24,25)26,18-10-6-3-7-11-18)21(30)28-12-13-29-19(15-28)14-20(27-29)32-16-17-8-4-2-5-9-17;1-16-8-9-19(12-17(16)2)22(26)24-10-11-25-20(14-24)13-21(23-25)27-15-18-6-4-3-5-7-18;1-24(2)19-10-6-9-18(22-19)21(27)25-11-12-26-17(14-25)13-20(23-26)28-15-16-7-4-3-5-8-16;1-16-3-5-18(6-4-16)21(26)24-11-2-12-25-19(14-24)13-20(23-25)27-15-17-7-9-22-10-8-17;1-16-9-10-19(23(16)2)21(26)24-11-6-12-25-18(14-24)13-20(22-25)27-15-17-7-4-3-5-8-17;1-16-6-5-9-18(12-16)21(25)23-10-11-24-19(14-23)13-20(22-24)26-15-17-7-3-2-4-8-17;21-18-9-5-4-8-17(18)20(25)23-10-11-24-16(13-23)12-19(22-24)26-14-15-6-2-1-3-7-15/h2-11,14H,12-13,15-16H2,1H3;3-9,12-13H,10-11,14-15H2,1-2H3;3-10,13H,11-12,14-15H2,1-2H3;3-10,13H,2,11-12,14-15H2,1H3;3-5,7-10,13H,6,11-12,14-15H2,1-2H3;2-9,12-13H,10-11,14-15H2,1H3;1-9,12H,10-11,13-14H2/t22-;;;;;;/m0....../s1
• InChIKey: KSBQCUAJNQEWTB-JMCKARTDSA-N
• XLogP: 23.79
• TPSA: 374.70 Ų
• H-Bond Acceptors: 33
• Rotatable Bonds: 31
• Heavy Atoms: 193
• Complexity: —

Lipinski Rule of Five

3 violations

Rule	Value
MW ≤ 500	2626.47
LogP ≤ 5	23.79
H-Bond Donors ≤ 5	0
H-Bond Acceptors ≤ 10	33

Frequently Asked Questions

What is the IUPAC name of (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one?

The IUPAC name of (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one (CID 159224185) is (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one.

What is the SMILES notation for (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one?

The canonical SMILES for (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one is CN(C)c1cccc(C(=O)N2CCn3nc(OCc4ccccc4)cc3C2)n1.CO[C@](C(=O)N1CCn2nc(OCc3ccccc3)cc2C1)(c1ccccc1)C(F)(F)F.Cc1ccc(C(=O)N2CCCn3nc(OCc4ccccc4)cc3C2)n1C.Cc1ccc(C(=O)N2CCCn3nc(OCc4ccncc4)cc3C2)cc1.Cc1ccc(C(=O)N2CCn3nc(OCc4ccccc4)cc3C2)cc1C.Cc1cccc(C(=O)N2CCn3nc(OCc4ccccc4)cc3C2)c1.O=C(c1ccccc1Cl)N1CCn2nc(OCc3ccccc3)cc2C1.

What is the InChIKey of (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one?

The InChIKey is KSBQCUAJNQEWTB-JMCKARTDSA-N. The full InChI is InChI=1S/C23H22F3N3O3.C22H23N3O2.C21H23N5O2.C21H22N4O2.C21H24N4O2.C21H21N3O2.C20H18ClN3O2/c1-31-22(23(24,25)26,18-10-6-3-7-11-18)21(30)28-12-13-29-19(15-28)14-20(27-29)32-16-17-8-4-2-5-9-17;1-16-8-9-19(12-17(16)2)22(26)24-10-11-25-20(14-24)13-21(23-25)27-15-18-6-4-3-5-7-18;1-24(2)19-10-6-9-18(22-19)21(27)25-11-12-26-17(14-25)13-20(23-26)28-15-16-7-4-3-5-8-16;1-16-3-5-18(6-4-16)21(26)24-11-2-12-25-19(14-24)13-20(23-25)27-15-17-7-9-22-10-8-17;1-16-9-10-19(23(16)2)21(26)24-11-6-12-25-18(14-24)13-20(22-25)27-15-17-7-4-3-5-8-17;1-16-6-5-9-18(12-16)21(25)23-10-11-24-19(14-23)13-20(22-24)26-15-17-7-3-2-4-8-17;21-18-9-5-4-8-17(18)20(25)23-10-11-24-16(13-23)12-19(22-24)26-14-15-6-2-1-3-7-15/h2-11,14H,12-13,15-16H2,1H3;3-9,12-13H,10-11,14-15H2,1-2H3;3-10,13H,11-12,14-15H2,1-2H3;3-10,13H,2,11-12,14-15H2,1H3;3-5,7-10,13H,6,11-12,14-15H2,1-2H3;2-9,12-13H,10-11,14-15H2,1H3;1-9,12H,10-11,13-14H2/t22-;;;;;;/m0....../s1.

What are the key properties of (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one?

(2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one has a molecular weight of 2626.47 g/mol, XLogP of 23.79, 31 rotatable bonds, 0 hydrogen bond donors, and 33 hydrogen bond acceptors.

Where does this data come from?

All data for (2-chlorophenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;[6-(dimethylamino)-2-pyridinyl]-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(3,4-dimethylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(1,5-dimethylpyrrol-2-yl)-(2-phenylmethoxy-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl)methanone;(3-methylphenyl)-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)methanone;(4-methylphenyl)-[2-(pyridin-4-ylmethoxy)-4,6,7,8-tetrahydropyrazolo[1,5-a][1,4]diazepin-5-yl]methanone;(2S)-3,3,3-trifluoro-2-methoxy-2-phenyl-1-(2-phenylmethoxy-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl)propan-1-one is sourced from PubChem (CID 159224185), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).