InChI=1/C16H27O5P/c1-5-18-16(19-6-2)15-11-9-14(10-12-15)13-22(17,20-7-3)21-8-4/h9-12,16H,5-8,13H2,1-4H diethyl [4-(diethoxymethyl)benzyl]phosphonate phosphonic acid, [[4-(diethoxymethyl)phenyl]methyl]-, diethyl ester