InChI=1/C16H21N2O4PS/c1-4-21-23(20,22-5-2)11-10-14-16(3,19)18-13-9-7-6-8-12(13)17-15(18)24-14/h6-10,19H,4-5,11H2,1-3H3/b14-10 diethyl [(2Z)-2-(3-hydroxy-3-methyl[1,3]thiazolo[3,2-a]benzimidazol-2(3H)-ylidene)ethyl]phosphonate phosphonic acid, [(2Z)-2-(3-hydroxy-3-methylthiazolo[3,2-a]benzimidazol-2(3H)-ylidene)ethyl]-, diethyl ester