3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone

C91H84O48 — CID 162110111

IUPAC3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone
SMILESCC12C(=O)OC(=O)C1(C)C1(C)C(=O)OC(=O)C21C.CC12C(=O)OC(=O)C1C1(C)C(=O)OC(=O)C21.O=C1CC(C2CC(=O)OC2=O)C(=O)O1.O=C1CC2C(CC3C(=O)OC(=O)C32)C(=O)O1.O=C1OC(=O)C2C1CC1C(=O)OC(=O)C12.O=C1OC(=O)C2CC(C3CCC4C(=O)OC(=O)C4C3)CCC12.O=C1OC(=O)C2CC(C3CCCC4C(=O)OC(=O)C43)CCC12.O=C1OC(=O)C2CC3C(=O)OC(=O)C3CC12
InChIInChI=1S/2C16H18O6.C12H12O6.3C10H8O6.C9H6O6.C8H6O6/c17-13-9-3-1-7(5-11(9)15(19)21-13)8-2-4-10-12(6-8)16(20)22-14(10)18;17-13-9-5-4-7(6-11(9)15(19)21-13)8-2-1-3-10-12(8)16(20)22-14(10)18;1-9-5(13)17-6(14)10(9,2)12(4)8(16)18-7(15)11(9,12)3;1-9-3(5(11)15-7(9)13)10(2)4(9)6(12)16-8(10)14;11-6-2-3-4(8(12)15-6)1-5-7(3)10(14)16-9(5)13;11-7-3-1-4-6(10(14)16-8(4)12)2-5(3)9(13)15-7;10-6-2-1-3-5(4(2)8(12)14-6)9(13)15-7(3)11;9-5-1-3(7(11)13-5)4-2-6(10)14-8(4)12/h2*7-12H,1-6H2;1-4H3;3-4H,1-2H3;3-5,7H,1-2H2;3-6H,1-2H2;2-5H,1H2;3-4H,1-2H2
InChIKeyZGAQGIGWQOXTRP-UHFFFAOYSA-N
MW1945.63 g/mol
LogP-0.95
Rot. Bonds3

About 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone

3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone (PubChem CID 162110111) has the molecular formula C91H84O48 and a molecular weight of 1945.63 g/mol. Its IUPAC name is 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone.

Molecular Properties

Compound Name3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone
PubChem CID162110111
Molecular FormulaC91H84O48
Molecular Weight1945.63 g/mol
Exact Mass1944.41
IUPAC Name3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone
SMILESCC12C(=O)OC(=O)C1(C)C1(C)C(=O)OC(=O)C21C.CC12C(=O)OC(=O)C1C1(C)C(=O)OC(=O)C21.O=C1CC(C2CC(=O)OC2=O)C(=O)O1.O=C1CC2C(CC3C(=O)OC(=O)C32)C(=O)O1.O=C1OC(=O)C2C1CC1C(=O)OC(=O)C12.O=C1OC(=O)C2CC(C3CCC4C(=O)OC(=O)C4C3)CCC12.O=C1OC(=O)C2CC(C3CCCC4C(=O)OC(=O)C43)CCC12.O=C1OC(=O)C2CC3C(=O)OC(=O)C3CC12
InChIInChI=1S/2C16H18O6.C12H12O6.3C10H8O6.C9H6O6.C8H6O6/c17-13-9-3-1-7(5-11(9)15(19)21-13)8-2-4-10-12(6-8)16(20)22-14(10)18;17-13-9-5-4-7(6-11(9)15(19)21-13)8-2-1-3-10-12(8)16(20)22-14(10)18;1-9-5(13)17-6(14)10(9,2)12(4)8(16)18-7(15)11(9,12)3;1-9-3(5(11)15-7(9)13)10(2)4(9)6(12)16-8(10)14;11-6-2-3-4(8(12)15-6)1-5-7(3)10(14)16-9(5)13;11-7-3-1-4-6(10(14)16-8(4)12)2-5(3)9(13)15-7;10-6-2-1-3-5(4(2)8(12)14-6)9(13)15-7(3)11;9-5-1-3(7(11)13-5)4-2-6(10)14-8(4)12/h2*7-12H,1-6H2;1-4H3;3-4H,1-2H3;3-5,7H,1-2H2;3-6H,1-2H2;2-5H,1H2;3-4H,1-2H2
InChIKeyZGAQGIGWQOXTRP-UHFFFAOYSA-N
XLogP-0.95
TPSA693.92 Ų
H-Bond Donors
H-Bond Acceptors48
Rotatable Bonds3
Heavy Atoms139
Complexity

Lipinski Rule of Five

2 violations

RuleValue
MW ≤ 5001945.63
LogP ≤ 5-0.95
H-Bond Donors ≤ 50
H-Bond Acceptors ≤ 1048

Computed Properties (RDKit)

Structural Alerts{'alert_name': '>_2_ester_groups', 'substructure': 'N/A'}, {'alert_name': 'beta-keto/anhydride', 'substructure': 'N/A'}

Analyze 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone with MolForge

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Frequently Asked Questions

What is the IUPAC name of 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone?
The IUPAC name of 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone (CID 162110111) is 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone.
What is the SMILES notation for 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone?
The canonical SMILES for 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone is CC12C(=O)OC(=O)C1(C)C1(C)C(=O)OC(=O)C21C.CC12C(=O)OC(=O)C1C1(C)C(=O)OC(=O)C21.O=C1CC(C2CC(=O)OC2=O)C(=O)O1.O=C1CC2C(CC3C(=O)OC(=O)C32)C(=O)O1.O=C1OC(=O)C2C1CC1C(=O)OC(=O)C12.O=C1OC(=O)C2CC(C3CCC4C(=O)OC(=O)C4C3)CCC12.O=C1OC(=O)C2CC(C3CCCC4C(=O)OC(=O)C43)CCC12.O=C1OC(=O)C2CC3C(=O)OC(=O)C3CC12.
What is the InChIKey of 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone?
The InChIKey is ZGAQGIGWQOXTRP-UHFFFAOYSA-N. The full InChI is InChI=1S/2C16H18O6.C12H12O6.3C10H8O6.C9H6O6.C8H6O6/c17-13-9-3-1-7(5-11(9)15(19)21-13)8-2-4-10-12(6-8)16(20)22-14(10)18;17-13-9-5-4-7(6-11(9)15(19)21-13)8-2-1-3-10-12(8)16(20)22-14(10)18;1-9-5(13)17-6(14)10(9,2)12(4)8(16)18-7(15)11(9,12)3;1-9-3(5(11)15-7(9)13)10(2)4(9)6(12)16-8(10)14;11-6-2-3-4(8(12)15-6)1-5-7(3)10(14)16-9(5)13;11-7-3-1-4-6(10(14)16-8(4)12)2-5(3)9(13)15-7;10-6-2-1-3-5(4(2)8(12)14-6)9(13)15-7(3)11;9-5-1-3(7(11)13-5)4-2-6(10)14-8(4)12/h2*7-12H,1-6H2;1-4H3;3-4H,1-2H3;3-5,7H,1-2H2;3-6H,1-2H2;2-5H,1H2;3-4H,1-2H2.
What are the key properties of 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone?
3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone has a molecular weight of 1945.63 g/mol, XLogP of -0.95, 3 rotatable bonds, 0 hydrogen bond donors, and 48 hydrogen bond acceptors.
Where does this data come from?
All data for 3a,4,4a,7a,8,8a-hexahydrofuro[3,4-f][2]benzofuran-1,3,5,7-tetrone;1,6-dimethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone;4,10-dioxatricyclo[6.4.0.02,6]dodecane-3,5,9,11-tetrone;4,10-dioxatricyclo[6.3.0.02,6]undecane-3,5,9,11-tetrone;4-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;5-(1,3-dioxo-3a,4,5,6,7,7a-hexahydro-2-benzofuran-5-yl)-3a,4,5,6,7,7a-hexahydro-2-benzofuran-1,3-dione;3-(2,5-dioxooxolan-3-yl)oxolane-2,5-dione;1,2,6,7-tetramethyl-4,9-dioxatricyclo[5.3.0.02,6]decane-3,5,8,10-tetrone is sourced from PubChem (CID 162110111), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).