We are dealing with a high range of Abamectin. It is a liquid fermentation product of streptomyces avermitilis and is a mixture of Avermectin B1a and B1b.These two components, B1a and B1b have very similar biological and toxicological properties and their formula and molecular weight is C48H72O14. =873.1 and C47H70O14. = 859.1 respectively.
