Spinosyns are a novel kind of biopesticide produced by Saccharopolyspora spinosa. Spinosyns have been widely applied in pest control because of their broad insecticidal spectrum, high insecticidal activity, low environmental impact, and low toxicity. To identify spinosyn compounds with improved insecticidal activity, a series of D-forosamine replacement derivatives of spinosyn A were synthesized. The insecticidal activities of the synthetic derivatives were evaluated against 3rd-instar larvae of Plutella xy...