.alpha.-Rubromycin 1H-2-Benzopyran-3-carboxylic acid, 6-[2-(4,9-dihydro-8-hydroxy-5,7-dimethoxy-4,9-dioxonaphtho[2,3-b]furan-2-yl)ethyl]-7,8-dihydroxy-1-oxo-, methyl ester 27267-69-2 6-[2-(4,9-Dihydro-8-hydroxy-5,7-dimethoxy-4,9-dioxonaphtho[2,3-b]furan-2-yl) AIDS-001776 AIDS001776 Collinomycin Naphtho[2,3-b]furan, 1H-2-benzopyran-3-carboxylic acid deriv.