Rifamycin G, a further product of Nocardia mediterranei metabolism.

Rifamycin G, a further product of Nocardia mediterranei metabolism. Rifamycin Z, a novel ansamycin from a mutant of Nocardia mediterranea. 3-Hydroxyrifamycin S and further novel ansamycins from a recombinant strain R-21 of Nocardia mediterranei. Early intermediates in the biosynthesis of ansamycins. II. Isolation and identification of proasamycin B-M1 and protorifamycin I-M1. ISOLATION AND STRUCTURE OF RIFAMYCIN L AND ITS BIOGENETIC RELATIONSHIP WITH OTHER RIFAMYCINS Biosynthetic origins of the oxygen atoms in the ansamycin antibiotics rifamycin B, O, and S Thiazorifamycins. III. Biosynthesis of rifamycins P,Q and verde, novel metabolites from a mutant of Nocardia mediterranea. 31-Homorifamycin W, a novel metabolite from Amycolatopsis mediterranei. Isolation of 11,12-<i>seco</i>-Rifamycin W Derivatives Reveals a Cleavage Pattern of the Rifamycin <i>Ansa</i> Chain The X-ray analysis of the structure of rifamycin Y