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