Structure based on 1v5y

Ideal structure
Name: 4-hydroxy-2h-chromen-2-one
Formula: C9 H6 O3
Weight: 162.142
SMILES: "OC1=CC(=O)Oc2ccccc12"
Spacial conformation based on PDB 1v5y.
Also present on 6y1u, 6y1v
RESIDUE   4HC     18
CONECT      CA     3 CA2  CA6  HA  
CONECT      CA2    3 CA   OA2  OA3 
CONECT      CA4    3 CA5  CD1  OA3 
CONECT      CA5    3 CA4  CA6  CD4 
CONECT      CA6    3 CA   CA5  OA6 
CONECT      CD1    3 CA4  CD2  HD1 
CONECT      CD2    3 CD1  CD3  HD2 
CONECT      CD3    3 CD2  CD4  HD3 
CONECT      CD4    3 CA5  CD3  HD4 
CONECT      OA2    1 CA2 
CONECT      OA3    2 CA2  CA4 
CONECT      OA6    2 CA6  HA6 
CONECT      HA     1 CA  
CONECT      HD1    1 CD1 
CONECT      HD2    1 CD2 
CONECT      HD3    1 CD3 
CONECT      HD4    1 CD4 
CONECT      HA6    1 OA6 
END   
HET    4HC             18
HETSYN     4HC 4-HYDROXY-1-BENZOPYRAN-2-ONE; 4-HYDROXYCOUMARIN
HETNAM     4HC 4-HYDROXY-2H-CHROMEN-2-ONE
FORMUL      4HC    C9 H6 O3

This OCA MONOMER page
uses Jmol, developed by the Jmol Development Team (color reference)
OCA© by Jaime Prilusky, 1996-2004,2006,2010,2014
Bioinformatics Unit
Weizmann Institute of Science