22089-21-0 2H-1,3,2-Oxazaphosphorine, tetrahydro-2-(bis(2-chloroethyl)amino)-3-heptyl-, 2-oxide B 742 Tetrahydro-2-(bis(2-chloroethyl)amino)-3-heptyl-2H-1,3,2-oxazaphosphorine 2-oxide