Structure based on 1lfo

Ideal structure
Name: butenoic acid
Formula: C4 H6 O2
Weight: 86.089
SMILES: "CC=CC(O)=O"
Spacial conformation based on PDB 1lfo.
Also present on 6hji
RESIDUE   BEO     12
CONECT      C1     3 O1   O2   C2  
CONECT      O1     1 C1  
CONECT      O2     2 C1   HO2 
CONECT      C2     3 C1   C3   H2  
CONECT      C3     3 C2   C4   H3  
CONECT      C4     4 C3   H41  H42  H43 
CONECT      HO2    1 O2  
CONECT      H2     1 C2  
CONECT      H3     1 C3  
CONECT      H41    1 C4  
CONECT      H42    1 C4  
CONECT      H43    1 C4  
END   
HET    BEO             12
HETNAM     BEO BUTENOIC ACID
FORMUL      BEO    C4 H6 O2

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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