1, 2 and 3 have been assigned to rifamycins P, Q and Verde, novel metabolites isolated from a mutant strain of Nocardia mediterranea both on the basis of spectroscopic evidence (UV, IR, MS, 1H and 13C NMR) in comparison with the model compounds rifamycin S (4), rifampicin (5) and 4-dimethylamino-4-deoxy-rifamycin SV (6), and of an unambiguous synthesis from rifamycin S (4).
结构1,2和3已被分配给利福霉素P,Q和佛得,从突变株中分离的新的代谢产物诺卡地中海两者的光谱证据的基础上(UV,IR,MS,1 H和13 C NMR)在比较与模型化合物利福霉素S(4),利福平(5)和4-二甲基氨基-4-脱氧利福霉素SV(6)以及利福霉素S的明确合成(4)。