after administration of acrylonitrile , crotononitrile and cinnamonitrile to rats , two types of mercapturic acids were isolated from urine and identified by mass and nmr spectroscopy as n-acetyl-s- ( 2-cyanoethyl ) -l-cysteine ( i ) and n-acetyl-s- ( 2-hydroxyethyl ) -l-cysteine ( ii ) ( methyl-substituted in the case of crotonitrile and phenyl-substituted in the case of cinnamonitrile ) .
C0001047
mercapturic acids
C0010654
l-cysteine