Oxaprozin Propionamide Impurity CAS No. : NAMolecular Formula: C18H16N2O2Molecular Weight : 292.33Chemical Name : 4,5-diphenyl-2-oxazole propionamide Propionate Impurity CAS No. : NAMolecular Formula: C19H17NO3Molecular Weight : 307.34Chemical Name : Methyl-4,5-diphenyl-2-oxazole propionate