6H-Benzo(d)naphtho(1,2-b)pyran-6-one, 4-(4-O-acetyl-3,6-dideoxy-3-(dimethylamino)-alpha-altropyranosyl)-10,12-dimethoxy-8-ethenyl-1-hydroxy- 74622-75-6 AY 25545 Ravidomycin