paracetamol and its four main metabolites , the sulphate ( s ) , glucuronide ( g ) , cysteine ( c ) and mercapturic acid ( m ) conjugates , are readily separated in a synthetic mixture using slightly acidic aqueous alcoholic eluents ( e.g . water-methanol-formic acid , 85:15:0.15 , v/v/v ) on either octadecyl silica ( ods silica ) or octadecyl silica which has been further silanized to remove residual hydroxyl groups ( ods/tms silica ) .
C0010654
cysteine
C0001047
mercapturic acid