THERMODYNAMICALLY STABLE CRYSTALLINE FORM OF 4 '-DESOXY-4' -EPIMETHYLAMINO-AVERMECTIN B1A / B1B BENZOIC ACID SALT AND PROCESSES FOR PREPARATION

摘要

The most thermodynamically stable crystalline form of the benzoic acid salt of 4"-deoxy-4"-epi-methylamino avermectin B1a/B1b as the hemihydrate is obtained by crystallization from organic solvents containing a controlled amount of water.