InChI=1/C13H23N2O5P/c1-3-19-21(17,20-4-2)12(11-14)13(18-10-9-16)15-7-5-6-8-15/h16H,3-10H2,1-2H3/b13-12 diethyl [(E)-1-cyano-2-(2-hydroxyethoxy)-2-pyrrolidin-1-ylvinyl]phosphonate phosphonic acid, [(E)-1-cyano-2-(2-hydroxyethoxy)-2-(1-pyrrolidinyl)ethenyl]-, diethyl ester