2,3-Dihydro-7-methoxy-3-((4-nitrophenyl)methylene)-4H-1-benzopyran-4-one 4-18-00-00736 (Beilstein Handbook Reference) 4H-1-Benzopyran-4-one, 2,3-dihydro-7-methoxy-3-((4-nitrophenyl)methylene)- 78431-35-3 BRN 0044047