MODRES 3DEK OCS A  163  CYS  CYSTEINESULFONIC ACID                              
MODRES 3DEK OCS B  163  CYS  CYSTEINESULFONIC ACID                              
MODRES 3DEK OCS C  163  CYS  CYSTEINESULFONIC ACID                              
MODRES 3DEK OCS D  163  CYS  CYSTEINESULFONIC ACID