1,3,2-Dioxaphosphorinane-5,5-dimethanol, 2-(1-aziridinyl)-, 2-oxide (9CI) 1-Aziridinyl phosphonic acid cyclic diester with pentaerithritol 18722-72-0 ENT-51909 Phosphonic acid, 1-aziridinyl-, cyclic 2,2-bis(hydroxymethyl)trimethylene ester