A1EPA

2',4',5',7'-tetrakis(iodanyl)-3',6'-bis(oxidanyl)spiro[2-benzofuran-3,9'-xanthene]-1-one

Created:	2025-04-17
Last modified:	2026-04-15

Find Related PDB Entry
1 entries where A1EPA is found as a standalone ligand

Find related ligands:

Similar Ligands (Stereospecific) Similar Ligands (including Stereoisomers) Similar Ligands (Quick Screen) Similar Ligands (Substructure Stereospecific) Similar Ligands (Substructure including Stereoisomers)

Chemical Details
Formal Charge	0
Atom Count	37
Chiral Atom Count	1
Bond Count	41
Aromatic Bond Count	18

2D diagram of A1EPA

Toggle Hydrogen Toggle Labels

Chemical Component Summary
Name	2',4',5',7'-tetrakis(iodanyl)-3',6'-bis(oxidanyl)spiro[2-benzofuran-3,9'-xanthene]-1-one
Synonyms	Erythrosine
Systematic Name (OpenEye OEToolkits)	2',4',5',7'-tetrakis(iodanyl)-3',6'-bis(oxidanyl)spiro[2-benzofuran-3,9'-xanthene]-1-one
Formula	C₂₀ H₈ I₄ O₅
Molecular Weight	835.892
Type	NON-POLYMER

Chemical Descriptors
Type	Program	Version	Descriptor
SMILES	CACTVS	3.385	Oc1c(I)cc2c(Oc3c(I)c(O)c(I)cc3[C]24OC(=O)c5ccccc45)c1I
SMILES	OpenEye OEToolkits	2.0.7	c1ccc2c(c1)C(=O)OC23c4cc(c(c(c4Oc5c3cc(c(c5I)O)I)I)O)I
Canonical SMILES	CACTVS	3.385	Oc1c(I)cc2c(Oc3c(I)c(O)c(I)cc3[C@]24OC(=O)c5ccccc45)c1I
Canonical SMILES	OpenEye OEToolkits	2.0.7	c1ccc2c(c1)C(=O)OC23c4cc(c(c(c4Oc5c3cc(c(c5I)O)I)I)O)I
InChI	InChI	1.06	InChI=1S/C20H8I4O5/c21-11-5-9-17(13(23)15(11)25)28-18-10(6-12(22)16(26)14(18)24)20(9)8-4-2-1-3-7(8)19(27)29-20/h1-6,25-26H
InChIKey	InChI	1.06	OALHHIHQOFIMEF-UHFFFAOYSA-N

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.