[(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate

C68H110O33 — CID 155548559

IUPAC[(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate
SMILESC[C@@H]1O[C@@H](O[C@@H]2[C@@H](O[C@@H]3O[C@@H](C)[C@H](O[C@@H]4OC[C@@H](O)[C@H](O)[C@H]4O)[C@@H](O[C@@H]4OC[C@](O)(CO)[C@H]4O)[C@H]3O)[C@H](OC(=O)[C@]34CCC(C)(C)C[C@H]3C3=CC[C@@H]5[C@@]6(C)C[C@H](O)[C@H](O[C@@H]7O[C@H](CO[C@@H]8OC[C@H](O)[C@H](O)[C@H]8O)[C@@H](O)[C@H](O)[C@H]7O)C(C)(C)[C@@H]6CC[C@@]5(C)[C@]3(C)CC4)OC[C@H]2O)[C@H](O)[C@H](O)[C@H]1O
InChIInChI=1S/C68H110O33/c1-26-37(74)41(78)45(82)56(93-26)97-49-33(73)22-90-59(51(49)99-58-47(84)50(98-60-52(85)68(87,24-69)25-92-60)48(27(2)94-58)96-55-44(81)39(76)32(72)21-89-55)101-61(86)67-16-14-62(3,4)18-29(67)28-10-11-36-64(7)19-30(70)53(63(5,6)35(64)12-13-66(36,9)65(28,8)15-17-67)100-57-46(83)42(79)40(77)34(95-57)23-91-54-43(80)38(75)31(71)20-88-54/h10,26-27,29-60,69-85,87H,11-25H2,1-9H3/t26-,27-,29-,30-,31-,32+,33+,34+,35-,36+,37-,38-,39-,40+,41+,42-,43+,44+,45+,46+,47+,48-,49-,50-,51+,52-,53-,54-,55-,56-,57-,58-,59-,60-,64-,65+,66+,67-,68+/m0/s1
InChIKeyGSWMAUIIOMZHKI-NNKZRMKDSA-N
MW1455.59 g/mol
LogP-4.98
Rot. Bonds16

About [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate

[(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate (PubChem CID 155548559) has the molecular formula C68H110O33 and a molecular weight of 1455.59 g/mol. Its IUPAC name is [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate.

Molecular Properties

Compound Name[(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate
PubChem CID155548559
Molecular FormulaC68H110O33
Molecular Weight1455.59 g/mol
Exact Mass1454.69
IUPAC Name[(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate
SMILESC[C@@H]1O[C@@H](O[C@@H]2[C@@H](O[C@@H]3O[C@@H](C)[C@H](O[C@@H]4OC[C@@H](O)[C@H](O)[C@H]4O)[C@@H](O[C@@H]4OC[C@](O)(CO)[C@H]4O)[C@H]3O)[C@H](OC(=O)[C@]34CCC(C)(C)C[C@H]3C3=CC[C@@H]5[C@@]6(C)C[C@H](O)[C@H](O[C@@H]7O[C@H](CO[C@@H]8OC[C@H](O)[C@H](O)[C@H]8O)[C@@H](O)[C@H](O)[C@H]7O)C(C)(C)[C@@H]6CC[C@@]5(C)[C@]3(C)CC4)OC[C@H]2O)[C@H](O)[C@H](O)[C@H]1O
InChIInChI=1S/C68H110O33/c1-26-37(74)41(78)45(82)56(93-26)97-49-33(73)22-90-59(51(49)99-58-47(84)50(98-60-52(85)68(87,24-69)25-92-60)48(27(2)94-58)96-55-44(81)39(76)32(72)21-89-55)101-61(86)67-16-14-62(3,4)18-29(67)28-10-11-36-64(7)19-30(70)53(63(5,6)35(64)12-13-66(36,9)65(28,8)15-17-67)100-57-46(83)42(79)40(77)34(95-57)23-91-54-43(80)38(75)31(71)20-88-54/h10,26-27,29-60,69-85,87H,11-25H2,1-9H3/t26-,27-,29-,30-,31-,32+,33+,34+,35-,36+,37-,38-,39-,40+,41+,42-,43+,44+,45+,46+,47+,48-,49-,50-,51+,52-,53-,54-,55-,56-,57-,58-,59-,60-,64-,65+,66+,67-,68+/m0/s1
InChIKeyGSWMAUIIOMZHKI-NNKZRMKDSA-N
XLogP-4.98
TPSA510.43 Ų
H-Bond Donors18
H-Bond Acceptors33
Rotatable Bonds16
Heavy Atoms101
Complexity

Lipinski Rule of Five

3 violations

RuleValue
MW ≤ 5001455.59
LogP ≤ 5-4.98
H-Bond Donors ≤ 518
H-Bond Acceptors ≤ 1033

Computed Properties (RDKit)

Structural Alerts{'alert_name': 'isolated_alkene', 'substructure': 'N/A'}, {'alert_name': 'saponine_derivative', 'substructure': 'N/A'}

Analyze [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate with MolForge

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Related Compounds

Frequently Asked Questions

What is the IUPAC name of [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate?
The IUPAC name of [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate (CID 155548559) is [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate.
What is the SMILES notation for [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate?
The canonical SMILES for [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate is C[C@@H]1O[C@@H](O[C@@H]2[C@@H](O[C@@H]3O[C@@H](C)[C@H](O[C@@H]4OC[C@@H](O)[C@H](O)[C@H]4O)[C@@H](O[C@@H]4OC[C@](O)(CO)[C@H]4O)[C@H]3O)[C@H](OC(=O)[C@]34CCC(C)(C)C[C@H]3C3=CC[C@@H]5[C@@]6(C)C[C@H](O)[C@H](O[C@@H]7O[C@H](CO[C@@H]8OC[C@H](O)[C@H](O)[C@H]8O)[C@@H](O)[C@H](O)[C@H]7O)C(C)(C)[C@@H]6CC[C@@]5(C)[C@]3(C)CC4)OC[C@H]2O)[C@H](O)[C@H](O)[C@H]1O.
What is the InChIKey of [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate?
The InChIKey is GSWMAUIIOMZHKI-NNKZRMKDSA-N. The full InChI is InChI=1S/C68H110O33/c1-26-37(74)41(78)45(82)56(93-26)97-49-33(73)22-90-59(51(49)99-58-47(84)50(98-60-52(85)68(87,24-69)25-92-60)48(27(2)94-58)96-55-44(81)39(76)32(72)21-89-55)101-61(86)67-16-14-62(3,4)18-29(67)28-10-11-36-64(7)19-30(70)53(63(5,6)35(64)12-13-66(36,9)65(28,8)15-17-67)100-57-46(83)42(79)40(77)34(95-57)23-91-54-43(80)38(75)31(71)20-88-54/h10,26-27,29-60,69-85,87H,11-25H2,1-9H3/t26-,27-,29-,30-,31-,32+,33+,34+,35-,36+,37-,38-,39-,40+,41+,42-,43+,44+,45+,46+,47+,48-,49-,50-,51+,52-,53-,54-,55-,56-,57-,58-,59-,60-,64-,65+,66+,67-,68+/m0/s1.
What are the key properties of [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate?
[(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate has a molecular weight of 1455.59 g/mol, XLogP of -4.98, 16 rotatable bonds, 18 hydrogen bond donors, and 33 hydrogen bond acceptors.
Where does this data come from?
All data for [(2S,3R,4S,5R)-3-[(2S,3R,4S,5S,6S)-4-[(2S,3R,4R)-3,4-dihydroxy-4-(hydroxymethyl)oxolan-2-yl]oxy-3-hydroxy-6-methyl-5-[(2S,3R,4S,5R)-3,4,5-trihydroxyoxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl] (4aS,6aR,6aS,6bR,8aR,10R,11S,12aR,14bS)-11-hydroxy-2,2,6a,6b,9,9,12a-heptamethyl-10-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-[[(2S,3R,4S,5S)-3,4,5-trihydroxyoxan-2-yl]oxymethyl]oxan-2-yl]oxy-1,3,4,5,6,6a,7,8,8a,10,11,12,13,14b-tetradecahydropicene-4a-carboxylate is sourced from PubChem (CID 155548559), the world's largest open chemistry database maintained by the National Library of Medicine (NIH).