Conformations of saturated six-membered ring phosphorus heterocycles. X-ray crystallographic and 1H NMR study of cis-2-oxo-2-(dimethylamino)-3,5-diphenyl-1,3,2-oxazaphosphorinane, a cyclophosphamide-like molecule in a twist conformation. - Bentrude, Wesley G.; Day, Roberta O.; Holmes, Joan M. (Journal of the American Chemical Society, 1984)