RESIDUE   A1H6S     18
CONECT      C01    4 C02  H012 H013 H011
CONECT      C02    4 C01  C03  C07  O10 
CONECT      C03    4 C02  C04  H032 H031
CONECT      C04    3 C03  O05  O06 
CONECT      C07    3 C02  O08  O09 
CONECT      O05    2 C04  H1  
CONECT      O06    1 C04 
CONECT      O08    2 C07  H2  
CONECT      O09    1 C07 
CONECT      O10    2 C02  H101
CONECT      H012   1 C01 
CONECT      H013   1 C01 
CONECT      H011   1 C01 
CONECT      H032   1 C03 
CONECT      H031   1 C03 
CONECT      H1     1 O05 
CONECT      H2     1 O08 
CONECT      H101   1 O10 
END   
HET    A1H6S             18
HETNAM     A1H6S (2~{S})-2-methyl-2-oxidanyl-butanedioic acid
FORMUL      A1H6S    C5 H8 O5