Rifamycin O

Chemical Name: [(2RS,2′S,12′Z,14′E,16′S,17′S,18′R,19′R,20′R,21′S,22′R,23′S,24′E)-5′,17′,19′-trihydroxy-23′-methoxy-2′,4′,12′,16′,18′,20′,22′-heptamethyl-1′,4,6′,11′-tetraoxo-1′,2′-dihydrospiro[1,3-dioxolane-2,9′(6′H)-[2,7](epoxypentadeca[1,11,13]trienazano)naphtho[2,1-b]furan]-21′-yl acetate