... avermitilis. It contains > 80% avermectin B1a and < 20% avermectin B1b. These two components, B1a and B1b have very similar biological and ... program. Product kind: Insecticide (and acaricide)Molecular Formula: C48H72O14 (avermectin B1a) + C47H70O14 (avermectin B1b)Technical: 95% TCType of formulation: 1. ... . I. Content, %95.0 min1.8 min3.6 minContent B1a, %90.0 min****Loss on Drying, %2.0 max**** ...