InChI=1/C9H14NO5P/c1-3-14-16(11,15-4-2)8(7-10)9-12-5-6-13-9/h3-6H2,1-2H diethyl [cyano(1,3-dioxolan-2-ylidene)methyl]phosphonate phosphonic acid, (cyano-1,3-dioxolan-2-ylidenemethyl)-, diethyl ester