dioxolanne de la bromo-6 methoxy-8 dihydro-2,3 4H-benzopyranne-1 one-4

dioxolanne-4 methoxy-8 dihydro-2,3 4H-benzopyranne-1 carbaldehyde-6

methyl 5-methoxy-7,8-dihydro-1H-spiro[pyrano[2,3-g]indole-9,2'-[1,3]dioxolane]-2-carboxylate

bromo-6 methoxy-8 dihydro-2,3 4H-benzopyranne-1 one-4