InChI=1/C16H21N2O4PS/c1-4-21-23(20,22-5-2)11-10-15(12(3)19)24-16-17-13-8-6-7-9-14(13)18-16/h6-10H,4-5,11H2,1-3H3,(H,17,18)/b15-10 diethyl [(2Z)-3-(1H-benzimidazol-2-ylthio)-4-oxopent-2-en-1-yl]phosphonate phosphonic acid, [(2Z)-3-(1H-benzimidazol-2-ylthio)-4-oxo-2-pentenyl]-, diethyl ester