116314-67-1 130929-57-6 2-Cyano-N,N-diethyl-3-(3,4-dihydroxy-5-nitrophenyl)propenamide 2-Propenamide, 2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl- Comtan Entacapone OR 611 OR-611