InChI=1/C10H18N3O3P/c1-3-15-17(14,16-4-2)9(8-11)10-12-6-5-7-13-10/h12-13H,3-7H2,1-2H diethyl [cyano(tetrahydropyrimidin-2(1H)-ylidene)methyl]phosphonate phosphonic acid, [cyano(tetrahydro-2(1H)-pyrimidinylidene)methyl]-, diethyl ester