3-Hydroxyrifamycin S and further novel ansamycins from a recombinant strain R-21 of Nocardia mediterranei.

ABSTRACT

The structures of 3-hydroxyrifamycin S and six further novel ansamycins isolated from the recombinant strain R-21 of Nocardia mediterranei were identified by spectroscopic methods. Three types of structure were distinguished Type 1 Ansamycins of the rifamycin S type Type 2 Ansamycins of the rifamycin G type Type 3 Ansamycins of the rifamycin W type.