InChI=1/C13H13NO3S/c1-3-17-13(16)11(8(2)15)12-14-9-6-4-5-7-10(9)18-12/h4-7,14H,3H2,1-2H3/b12-11 butanoic acid, 2-(2(3H)-benzothiazolylidene)-3-oxo-, ethyl ester, (2E)- ethyl (2E)-2-(1,3-benzothiazol-2(3H)-ylidene)-3-oxobutanoate