for the following products
2-N-Propyl-4-methyl-6-carboxy benzimidazole | 4-Methyl-2-n-propyl-1H-benzimidazole-6-carboxylic acid | 4-Methyl-2-propyl-1H-benzimidazole-6-carboxylic acid | 7-Methyl-2-propyl-1H-benzimidazole-5-carboxylic acid and 1H-Benzimidazole-4-methyl-2-propyl-6-carboxylic acid
