(E)-6,7-Dimethyl-4-(2-(5-nitro-2-furanyl)ethenyl)-2H-1-benzopyran-2-one 2H-1-Benzopyran-2-one, 6,7-dimethyl-4-(2-(5-nitro-2-furanyl)ethenyl)-, (E)- 6,7-Dimethyl-4-(2-(5-nitro-2-furyl)vinyl)coumarin 68746-93-0