China Factory Supply High Purity Saxagliptin Intermediate 1-Methyl-5-Amino-1h-Benzimidazole-2-Butanoic Acid Ethyl Ester, CAS No. 3543-73-5, Find details about China Saxagliptin Intermediate, CAS No. 3543-73-5 from Factory Supply High Purity Saxagliptin Intermediate 1-Methyl-5-Amino-1h-Benzimidazole-2-Butanoic Acid Ethyl Ester, CAS No. 3543-73-5