2-(1H-benzimidazol-2-ylthio)butanoic acid InChI=1/C11H12N2O2S/c1-2-9(10(14)15)16-11-12-7-5-3-4-6-8(7)13-11/h3-6,9H,2H2,1H3,(H,12,13)(H,14,15 butanoic acid, 2-(1H-benzimidazol-2-ylthio)-