Faropenem Impurity AFaropenem Impurity CFaropenem finished product impurity 4(R)-5-(Tetrahydrofuran-2-yl)thiazole-4-carboxylic Acid4-Thiazolecarboxylic acid, 5-[(2R)-tetrahydro-2-furanyl]-Faropenem Impurity 1Q: What is Faropenem Impurity 1 Q: What is the CAS Number of Faropenem Impurity 1