1H-Purin-6-amine, N-[3-[[(2-chloroethyl)(2-chloro-1-methylethyl)amino]methyl]phenyl]-, dihydrochloride, (.+-.)- Adenine, N-[.alpha.-[(2-chloroethyl)(2-chloro-DL-1-methylethyl)amino]-m-tolyl]-, dihydrochloride NSC101657