Nepafenac Impurity A with CAS No: 2835-77-0 is an impurity standard of Nepafenac. Nepafenac is a nonsteroidal anti-inflammatory drug (NSAID) that is used in ophthalmology as an eye drop solution.Nepafenac, when applied as an eye drop, inhibits the action of enzymes known as cyclooxygenases (COX-1 and COX-2) within the eye. Nepafenac is available as an ophthalmic solution (eye drops). Buy high quality Nepafenac Impurity A from Molsyns Research. Molsyns Research is one of the leading manufacturer and exporter of Nepafenac Impurity A