Entacapone EP Impurity G

: N,N-Bis-desethyl, N-Methyl Entacapone; (2E)-2-Cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-methyl-2-propenamide; (2E)-2-Cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-methyl-prop-2-enamide; (E)-2-cyano-3-(3,4-dihydroxy-5-nitrophenyl)-N-methylprop-2-enamide;