Cyclic polypeptide with antibiotic activity, process for its preparation and pure culture of a Coelomycetes strain.

摘要

A polypeptide compound of the following general formula : <CHEM> wherein R<1> is hydrogen or acyl group, R<2> is hydroxy or acyloxy, R<3> is hydrogen or hydroxysulfonyloxy, and R<4> is hydrogen or carbamoyl, with proviso that (i) R<2> is acyloxy, when R<3> is hydrogen, and (ii) R<1> is not palmitoyl, when R<2> is hydroxy, R<3> is hydroxysulfonyloxy and R<4> is carbamoyl, and a pharmaceutically acceptable salt thereof, processes for their preparation and pharmaceutical compositions comprising them. The invention relates also to intermediates of the formula <CHEM> wherein R<6> is (C4-C6)alkoxy, higher alkoxy or higher alkenyloxy, and R<7> is -COOH or -SO3H, or its reactive derivative at the carboxy group or a salt thereof and <CHEM> Wherein R<8> is 1 to 4 halogen, and R<9> is lower alkoxy which has one or more halogen, higher alkoxy which has one or more halogen, or its reactive derivative at the carboxy group or a salt thereof. The invention also relates to a biologically pure culture of the microorganism Coelomycetes strain F-11899 (FERM BP-2635).