Butyric acid, 2-amino-4-(p-[bis(2-chloroethyl)amino]benzylthio)- Butyric acid, 2-amino-4-[[p-[bis(2-chloroethyl)amino]benzyl]thio]- L-Homocysteine, S-[[4-[bis(2-chloroethyl)amino]phenyl]methyl]- MP 909 NSC60430