[1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone

C120H117F18N37O7S — CID 159946676

About [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone

[1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone (PubChem CID 159946676) has the molecular formula C120H117F18N37O7S and a molecular weight of 2563.54 g/mol. Its IUPAC name is [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone.

Molecular Properties

• Compound Name: [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone
• PubChem CID: 159946676
• Molecular Formula: C120H117F18N37O7S
• Molecular Weight: 2563.54 g/mol
• Exact Mass: 2561.94
• IUPAC Name: [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone
• SMILES: CS(=O)(=O)C1CC(N2CCN(c3ccnc(-c4cnc5ccc(C(F)(F)F)cn45)n3)C[C@H]2c2cn[nH]c2)C1.C[C@@H]1CN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)C[C@H](C)N1C(=O)C1(C)CC1.O=C(C1CCOCC1)N1CCN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)CC1c1cn[nH]c1.O=C(N1CCN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)CC1c1cn[nH]c1)C1(C(F)F)CC1.O=C([C@@H]1C[C@@H]1F)N1CCN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)CC1C1=CCN=C1
• InChI: InChI=1S/C25H25F3N8O2.C24H21F5N8O.C24H21F4N7O.C24H25F3N8O2S.C23H25F3N6O/c26-25(27,28)18-1-2-21-30-13-19(36(21)14-18)23-29-6-3-22(33-23)34-7-8-35(20(15-34)17-11-31-32-12-17)24(37)16-4-9-38-10-5-16;25-21(26)23(4-5-23)22(38)36-8-7-35(13-17(36)14-9-32-33-10-14)19-3-6-30-20(34-19)16-11-31-18-2-1-15(12-37(16)18)24(27,28)29;25-17-9-16(17)23(36)34-8-7-33(13-19(34)14-3-5-29-10-14)21-4-6-30-22(32-21)18-11-31-20-2-1-15(12-35(18)20)24(26,27)28;1-38(36,37)18-8-17(9-18)34-7-6-33(14-20(34)15-10-30-31-11-15)22-4-5-28-23(32-22)19-12-29-21-3-2-16(13-35(19)21)24(25,26)27;1-14-11-30(12-15(2)32(14)21(33)22(3)7-8-22)19-6-9-27-20(29-19)17-10-28-18-5-4-16(13-31(17)18)23(24,25)26/h1-3,6,11-14,16,20H,4-5,7-10,15H2,(H,31,32);1-3,6,9-12,17,21H,4-5,7-8,13H2,(H,32,33);1-4,6,10-12,16-17,19H,5,7-9,13H2;2-5,10-13,17-18,20H,6-9,14H2,1H3,(H,30,31);4-6,9-10,13-15H,7-8,11-12H2,1-3H3/t;;16-,17+,19?;17?,18?,20-;14-,15+/m..10./s1
• InChIKey: OBOQKZAVJNVTOP-GGUMFUHDSA-N
• XLogP: 17.52
• TPSA: 457.85 Ų
• H-Bond Donors: 3
• H-Bond Acceptors: 37
• Rotatable Bonds: 21
• Heavy Atoms: 183
• Complexity: —

Lipinski Rule of Five

3 violations

Rule	Value
MW ≤ 500	2563.54
LogP ≤ 5	17.52
H-Bond Donors ≤ 5	3
H-Bond Acceptors ≤ 10	37

Frequently Asked Questions

What is the IUPAC name of [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone?

The IUPAC name of [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone (CID 159946676) is [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone.

What is the SMILES notation for [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone?

The canonical SMILES for [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone is CS(=O)(=O)C1CC(N2CCN(c3ccnc(-c4cnc5ccc(C(F)(F)F)cn45)n3)C[C@H]2c2cn[nH]c2)C1.C[C@@H]1CN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)C[C@H](C)N1C(=O)C1(C)CC1.O=C(C1CCOCC1)N1CCN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)CC1c1cn[nH]c1.O=C(N1CCN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)CC1c1cn[nH]c1)C1(C(F)F)CC1.O=C([C@@H]1C[C@@H]1F)N1CCN(c2ccnc(-c3cnc4ccc(C(F)(F)F)cn34)n2)CC1C1=CCN=C1.

What is the InChIKey of [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone?

The InChIKey is OBOQKZAVJNVTOP-GGUMFUHDSA-N. The full InChI is InChI=1S/C25H25F3N8O2.C24H21F5N8O.C24H21F4N7O.C24H25F3N8O2S.C23H25F3N6O/c26-25(27,28)18-1-2-21-30-13-19(36(21)14-18)23-29-6-3-22(33-23)34-7-8-35(20(15-34)17-11-31-32-12-17)24(37)16-4-9-38-10-5-16;25-21(26)23(4-5-23)22(38)36-8-7-35(13-17(36)14-9-32-33-10-14)19-3-6-30-20(34-19)16-11-31-18-2-1-15(12-37(16)18)24(27,28)29;25-17-9-16(17)23(36)34-8-7-33(13-19(34)14-3-5-29-10-14)21-4-6-30-22(32-21)18-11-31-20-2-1-15(12-35(18)20)24(26,27)28;1-38(36,37)18-8-17(9-18)34-7-6-33(14-20(34)15-10-30-31-11-15)22-4-5-28-23(32-22)19-12-29-21-3-2-16(13-35(19)21)24(25,26)27;1-14-11-30(12-15(2)32(14)21(33)22(3)7-8-22)19-6-9-27-20(29-19)17-10-28-18-5-4-16(13-31(17)18)23(24,25)26/h1-3,6,11-14,16,20H,4-5,7-10,15H2,(H,31,32);1-3,6,9-12,17,21H,4-5,7-8,13H2,(H,32,33);1-4,6,10-12,16-17,19H,5,7-9,13H2;2-5,10-13,17-18,20H,6-9,14H2,1H3,(H,30,31);4-6,9-10,13-15H,7-8,11-12H2,1-3H3/t;;16-,17+,19?;17?,18?,20-;14-,15+/m..10./s1.

What are the key properties of [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone?

[1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone has a molecular weight of 2563.54 g/mol, XLogP of 17.52, 21 rotatable bonds, 3 hydrogen bond donors, and 37 hydrogen bond acceptors.

Where does this data come from?

All data for [1-(difluoromethyl)cyclopropyl]-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;[(2S,6R)-2,6-dimethyl-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]-(1-methylcyclopropyl)methanone;[(1S,2S)-2-fluorocyclopropyl]-[2-(2H-pyrrol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone;3-[4-[(3R)-4-(3-methylsulfonylcyclobutyl)-3-(1H-pyrazol-4-yl)piperazin-1-yl]pyrimidin-2-yl]-6-(trifluoromethyl)imidazo[1,2-a]pyridine;oxan-4-yl-[2-(1H-pyrazol-4-yl)-4-[2-[6-(trifluoromethyl)imidazo[1,2-a]pyridin-3-yl]pyrimidin-4-yl]piperazin-1-yl]methanone is sourced from PubChem (CID 159946676), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).