Hemihydrate of crystalline salt of 4-deoxy-4-epi-methylaminoavermectin B1a/B1b with benzoic acid, process of its preparation and preparation containing thereof

摘要

The invented hemihydrate of crystalline salt of 4"-deoxy-4"-epi-methylaminoavermectin B1a/B1b with benzoic acid in crystalline B-form can be used particularly for killing various parasites and agricultural pest. In the present invention there is further claimed a process for preparing said substance by re-crystallization of another form or a mixture of forms of such substance in an aqueous organic solvent. A preparation containing the aforementioned substance and intended for killing insects forms a part of the present solution, too.