NSC241267 Poly[imino-1-(2-carboxyethyl)-2-oxo-1,2-ethanediyl)], .alpha.-hydro-.omega.-[[2-[4-[bis(2-chloroethyl)amino]phenyl]-1-(ethoxycarbonyl)ethyl]amino]- Poly[imino[1-(2-carboxyethyl)-2-oxo-1,2-ethanediyl]], .alpha.-hydro-.omega.-[[1-[[4-[bis(2-chloroethyl)amino]phenyl]methyl]-2-ethoxy-2-oxoethyl]amino]-