abstract |
Macrocyclic compounds of formula I. in which either R is methyl and is a double bond in the 9,10-position, or in which R is hydrogen and is a single bond in the 9,10-position, can be microbiologically cultivated by culturing Sorangium cellulosum "So ce 26" (NCIB 12 411) win. They are active substances for combating plant diseases and can be used in the usual formulation. |