5-Pyrimidinecarboxylic acid, 4-[4-[bis(2-chloroethyl)amino]-3-methoxy-phenyl]-1,2,3,4-tetrahydro-6-methyl-2-oxo-, methyl ester 5-Pyrimidinecarboxylic acid, 4-[4-[bis(2-chloroethyl)amino]-3-methoxyphenyl]-1,2,3,4-tetrahydro-6-methyl-2-oxo-, methyl ester NSC166061