(2Z)-2-Cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethyl-2-propenamide;(Z)-Entacapone;CIS-ENTACAPONE;Entacapone impurity A -I;(Z)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethylprop-2-enamide;Entacapone Impurity 17(Entacapone EP Impurity A);Entacapone Related Compound A (25 mg) ((Z)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N,N-diethylacrylamide);Entacapone EP IMpurity A