Erythromycins, particularly ones with novel C-13 substituents R1 (e.g. C.sub.3 -C.sub.6 cycloalkyl or cycloalkenyl groups) are prepared by fermenting suitable organisms in the presence of R.sub.1 CO.sub.2 H. A preferred organism is Saccharopolyspora erythraea preferably containing an integrated plasmid capable of directing synthesis of desired compounds.

Erythromycins, particularmente uns com os substituents R1 da novela C-13 (por exemplo C.sub.3 - grupos do cycloalkyl C.sub.6 ou do cycloalkenyl) é preparado fermenting organismos apropriados na presença de R.sub.1 CO.sub.2 H. Um organismo preferido é erythraea de Saccharopolyspora que contem preferivelmente um plasmid integrado capaz de dirigir a síntese de compostos desejados.

 
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