Alanine, 3-[p-[bis(2-chloroethyl)amino]phenyl]-N-(tetrahydro-2H-1,3,2-oxazaphosphorin-2-yl)-, ethyl ester, P-oxide NSC57775 Phenylalanine, 4-[bis(2-chloroethyl)amino]-N-(tetrahydro-2H-1,3,2-oxazaphosphorin-2-yl)-, ethyl ester, P-oxide