RESIDUE   HUI     15
CONECT      O2     2 C1   H1  
CONECT      C1     3 O2   O1   C2  
CONECT      O1     1 C1  
CONECT      C2     4 C1   C3   C4   H2  
CONECT      C3     4 C2   H3   H4   H5  
CONECT      C4     4 C2   O3   H6   H7  
CONECT      O3     2 C4   H8  
CONECT      H1     1 O2  
CONECT      H2     1 C2  
CONECT      H3     1 C3  
CONECT      H4     1 C3  
CONECT      H5     1 C3  
CONECT      H6     1 C4  
CONECT      H7     1 C4  
CONECT      H8     1 O3  
END   
HET    HUI             15
HETSYN     HUI (S)-3-hydroxyisobutyric acid
HETNAM     HUI (2S)-2-methyl-3-oxidanyl-propanoic acid
FORMUL      HUI    C4 H8 O3