英文别名(alphaE)-alpha-[(3,4-Dihydroxy-5-nitrophenyl)methylene]-beta-oxo-1-piperidinepropanenitrile; Entacapone impurity H; Entacapone Impurity 24(Entacapone EP Impurity H); (E)-3-(3,4-dihydroxy-5-nitrophenyl)-2-(piperidine-1-carbonyl)prop-2-enenitrile; Entacapone Impurity 8; (2E)-3-(3,4-Dihydroxy-5-nitrophenyl)-2-(piperidine-1-carbonyl)acrylonitrile 
