8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))

C199H134N26O5Pt5 — CID 160808254

About 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))

8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)) (PubChem CID 160808254) has the molecular formula C199H134N26O5Pt5 and a molecular weight of 3944.83 g/mol. Its IUPAC name is 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)).

Molecular Properties

• Compound Name: 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))
• PubChem CID: 160808254
• Molecular Formula: C199H134N26O5Pt5
• Molecular Weight: 3944.83 g/mol
• Exact Mass: 3941.93
• IUPAC Name: 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))
• SMILES: Cc1ccc2c(c1)c1ccc(Oc3[c-]c4c(cc3)c3ccccc3n4-c3ccc(C(C)C)cn3)[c-]c1c1nnc(-c3ccccc3C)n21.Cc1ccc2c3ccc(Oc4[c-]c5c(cc4)c4ccccc4n5-c4ccccn4)[c-]c3c3nnc(-c4ccccc4C)n3c2c1.Cc1cccc(C)c1-c1cccc2c1c1ccc(Oc3[c-]c4c(cc3)c3ccccc3n4-c3ccccn3)[c-]c1c1nnc(C)n21.Cc1ccccc1-c1cc2c([c-]c1Oc1[c-]c3c(cc1)c1ccccc1n3-c1ccccn1)c1nncn1c1ccccc21.Cc1ccccc1-c1nnc2c3[c-]c(Oc4[c-]c5c(cn4)c4ccccc4n5-c4ccccn4)ccc3c3c(C(C)C)cccc3n12.[Pt+2].[Pt+2].[Pt+2].[Pt+2].[Pt+2]
• InChI: InChI=1S/C42H31N5O.C40H28N6O.C40H27N5O.C39H25N5O.C38H23N5O.5Pt/c1-25(2)28-14-20-40(43-24-28)46-37-12-8-7-11-33(37)34-18-16-30(23-39(34)46)48-29-15-17-32-35-21-26(3)13-19-38(35)47-41(31-10-6-5-9-27(31)4)44-45-42(47)36(32)22-29;1-24(2)27-14-10-16-34-38(27)30-19-18-26(21-31(30)40-44-43-39(46(34)40)28-12-5-4-11-25(28)3)47-37-22-35-32(23-42-37)29-13-6-7-15-33(29)45(35)36-17-8-9-20-41-36;1-24-10-8-11-25(2)38(24)32-13-9-15-35-39(32)31-20-18-27(22-33(31)40-43-42-26(3)44(35)40)46-28-17-19-30-29-12-4-5-14-34(29)45(36(30)23-28)37-16-6-7-21-41-37;1-24-14-17-31-29-18-15-26(22-33(29)39-42-41-38(44(39)35(31)21-24)28-10-4-3-9-25(28)2)45-27-16-19-32-30-11-5-6-12-34(30)43(36(32)23-27)37-13-7-8-20-40-37;1-24-10-2-3-11-26(24)31-21-30-28-13-4-6-14-33(28)42-23-40-41-38(42)32(30)22-36(31)44-25-17-18-29-27-12-5-7-15-34(27)43(35(29)20-25)37-16-8-9-19-39-37;;;;;/h5-21,24-25H,1-4H3;4-20,23-24H,1-3H3;4-21H,1-3H3;3-21H,1-2H3;2-19,21,23H,1H3;;;;;/q5*-2;5*+2
• InChIKey: BONKWZWNPVTRHU-UHFFFAOYSA-N
• XLogP: 47.34
• TPSA: 299.09 Ų
• H-Bond Acceptors: 31
• Rotatable Bonds: 22
• Heavy Atoms: 235
• Complexity: —

Lipinski Rule of Five

3 violations

Rule	Value
MW ≤ 500	3944.83
LogP ≤ 5	47.34
H-Bond Donors ≤ 5	0
H-Bond Acceptors ≤ 10	31

Computed Properties (RDKit)

• Structural Alerts: {'alert_name': 'Carbo_cation/anion', 'substructure': 'N/A'}, {'alert_name': 'Polycyclic_aromatic_hydrocarbon_3', 'substructure': 'N/A'}

Frequently Asked Questions

What is the IUPAC name of 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))?

The IUPAC name of 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)) (CID 160808254) is 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)).

What is the SMILES notation for 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))?

The canonical SMILES for 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)) is Cc1ccc2c(c1)c1ccc(Oc3[c-]c4c(cc3)c3ccccc3n4-c3ccc(C(C)C)cn3)[c-]c1c1nnc(-c3ccccc3C)n21.Cc1ccc2c3ccc(Oc4[c-]c5c(cc4)c4ccccc4n5-c4ccccn4)[c-]c3c3nnc(-c4ccccc4C)n3c2c1.Cc1cccc(C)c1-c1cccc2c1c1ccc(Oc3[c-]c4c(cc3)c3ccccc3n4-c3ccccn3)[c-]c1c1nnc(C)n21.Cc1ccccc1-c1cc2c([c-]c1Oc1[c-]c3c(cc1)c1ccccc1n3-c1ccccn1)c1nncn1c1ccccc21.Cc1ccccc1-c1nnc2c3[c-]c(Oc4[c-]c5c(cn4)c4ccccc4n5-c4ccccn4)ccc3c3c(C(C)C)cccc3n12.[Pt+2].[Pt+2].[Pt+2].[Pt+2].[Pt+2].

What is the InChIKey of 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))?

The InChIKey is BONKWZWNPVTRHU-UHFFFAOYSA-N. The full InChI is InChI=1S/C42H31N5O.C40H28N6O.C40H27N5O.C39H25N5O.C38H23N5O.5Pt/c1-25(2)28-14-20-40(43-24-28)46-37-12-8-7-11-33(37)34-18-16-30(23-39(34)46)48-29-15-17-32-35-21-26(3)13-19-38(35)47-41(31-10-6-5-9-27(31)4)44-45-42(47)36(32)22-29;1-24(2)27-14-10-16-34-38(27)30-19-18-26(21-31(30)40-44-43-39(46(34)40)28-12-5-4-11-25(28)3)47-37-22-35-32(23-42-37)29-13-6-7-15-33(29)45(35)36-17-8-9-20-41-36;1-24-10-8-11-25(2)38(24)32-13-9-15-35-39(32)31-20-18-27(22-33(31)40-43-42-26(3)44(35)40)46-28-17-19-30-29-12-4-5-14-34(29)45(36(30)23-28)37-16-6-7-21-41-37;1-24-14-17-31-29-18-15-26(22-33(29)39-42-41-38(44(39)35(31)21-24)28-10-4-3-9-25(28)2)45-27-16-19-32-30-11-5-6-12-34(30)43(36(32)23-27)37-13-7-8-20-40-37;1-24-10-2-3-11-26(24)31-21-30-28-13-4-6-14-33(28)42-23-40-41-38(42)32(30)22-36(31)44-25-17-18-29-27-12-5-7-15-34(27)43(35(29)20-25)37-16-8-9-19-39-37;;;;;/h5-21,24-25H,1-4H3;4-20,23-24H,1-3H3;4-21H,1-3H3;3-21H,1-2H3;2-19,21,23H,1H3;;;;;/q5*-2;5*+2.

What are the key properties of 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+))?

8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)) has a molecular weight of 3944.83 g/mol, XLogP of 47.34, 22 rotatable bonds, 0 hydrogen bond donors, and 31 hydrogen bond acceptors.

Where does this data come from?

All data for 8-(2,6-dimethylphenyl)-3-methyl-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;7-methyl-3-(2-methylphenyl)-11-[[9-(5-propan-2-yl-2-pyridinyl)-1H-carbazol-1-id-2-yl]oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;6-methyl-3-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;3-(2-methylphenyl)-8-propan-2-yl-11-[(5-pyridin-2-yl-4H-pyrido[4,3-b]indol-4-id-3-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;10-(2-methylphenyl)-11-[(9-pyridin-2-yl-1H-carbazol-1-id-2-yl)oxy]-12H-[1,2,4]triazolo[4,3-f]phenanthridin-12-ide;pentakis(platinum(2+)) is sourced from PubChem (CID 160808254), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).