for the following products
2,7-(Epoxypentadeca(1,11,13)trienimino)naphtho(2,1-b)furan-8-carboxaldehyde, 1,2-dihydro-5,6,9,17,19,21-hexahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-, 21-acetate | 3-Formyl-rifamycin and 3-Formyl rifamycin SV
