Nitrofurantoin Impurity 1 with CAS No: 91447-38-0 is an impurity standard of Nitrofurantoin. Nitrofurantoin is an antibiotic commonly used to treat urinary tract infections (UTIs).Nitrofurantoin is particularly effective against Gram-negative and Gram-positive bacteria commonly associated with UTIs. Nitrofurantoin is available in various formulations, including capsules and tablets. Buy high quality Nitrofurantoin Impurity 1 from Molsyns Research. Molsyns Research is one of the leading manufacturer and exporter of Nitrofurantoin Impurity 1