RESIDUE   UCU     15
CONECT      CAA    3 CAB  OAE  OAF 
CONECT      CAB    4 CAA  CAC  OAG  H1  
CONECT      CAC    4 CAB  CAD  H2   H3  
CONECT      CAD    4 CAC  H4   H5   H6  
CONECT      OAE    1 CAA 
CONECT      OAF    2 CAA  H7  
CONECT      OAG    2 CAB  H8  
CONECT      H1     1 CAB 
CONECT      H2     1 CAC 
CONECT      H3     1 CAC 
CONECT      H4     1 CAD 
CONECT      H5     1 CAD 
CONECT      H6     1 CAD 
CONECT      H7     1 OAF 
CONECT      H8     1 OAG 
END   
HET    UCU             15
HETSYN     UCU (R)-2-Hydroxybutanoic acid
HETNAM     UCU (2R)-2-oxidanylbutanoic acid
FORMUL      UCU    C4 H8 O3