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