2,5-Cyclohexadien-1-one, 2,5-dimethoxy-4-(3-phenyl-2-propenylidene)- 2,5-Dimethoxy-4-(3-phenylpropenylidene)-2,5-cyclohexadienone 37775-60-3 NSC269108 OBTUSAQUINONE DERIV JURD 2068