1,3-Dihydro-5-methyl-2H-benzimidazole-2-thione 2360-37-4 27231-36-3 2H-Benzimidazole-2-thione, 1,3-dihydro-5-methyl- 5-Methyl-2-mercaptobenzimidazole EINECS 248-350-5 NSC 231400