2605-67-6 InChI=1/C21H19O2P/c1-23-21(22)17-24(18-11-5-2-6-12-18,19-13-7-3-8-14-19)20-15-9-4-10-16-20/h2-17H,1H acetic acid, (triphenylphosphoranylidene)-, methyl ester methyl (triphenylphosphoranylidene)acetate