The invention provides new synergistin derivatives of formula ##STR1## in which Y is hydrogen or dimethylamino and R is a 3- or 4-quinuclidinyl radical, the isomers thereof and their mixtures, and their salts, also the preparation thereof. These compounds may be made by reaction of the corresponding 5-methylene compounds with the appropriate mercaptoquinuclidine. The products of formula (I), optionally combined with pristinamycin II.sub.A or a derivative of pristinamycin II.sub.B of the formula ##STR2## are useful as antimicrobials.
本发明提供了通式##STR1##所示的新协同霉素衍
生物,其中Y为氢或
二甲氨基,R为3-或4-喹核碱基,及其异构体和它们的混合物,以及它们的盐,还包括它们的制备方法。这些化合物可通过相应的5-亚甲基化合物与适当的巯基喹核碱反应制得。通式(I)的产品,可选择性地与普拉霉素II.sub.A或其衍
生物普拉霉素II.sub.B的通式##STR2##结合,作为抗微
生物剂使用。