(E)-4-(6-Methoxy-2-naphthalenyl)-4-oxo-2-butenoic acid 129119-99-9 2-Butenoic acid, 4-(6-methoxy-2-naphthalenyl)-4-oxo-, (E)- 4-(6-Methoxynaphthalen-2-yl)-4-oxo-2-butenoic acid MNOB