Antibiotic compounds.

摘要

Glycopeptide antibiotics MM 47766, MM 47767, MM 55256 and MM 55260 are produced by Amycolatopsis orientalis strain NCIB 40011. Two of them (MM 47767 and MM 55256) are represented by the formula: <CHEM> wherein R<1> is hydrogen and R<2> is methylamino (MM 47767) or R<1> is methylamino and R<2> is hydrogen (MM 55256) and wherein one of R<3>, R<4> and R<5> is the group: <CHEM> and the other two of R<3>, R<4> and R<5> are hydrogen. The other two antibiotic (MM 47766 and MM 55269) are characterised through their physicochemical parameters. The aglycone MT 55261 and pseudoaglycone MT 55262 of MM 47767 also exhibit useful antibiotic activity.