1H-1,2,3-benzotriazole-1-propanoic acid, beta-methylene-, methyl ester InChI=1/C11H11N3O2/c1-8(7-11(15)16-2)14-10-6-4-3-5-9(10)12-13-14/h3-6H,1,7H2,2H methyl 3-(1H-1,2,3-benzotriazol-1-yl)but-3-enoate