Title: Enzyme-catalysed [4+2] cycloaddition is a key step in the biosynthesis of spinosyn A.
Journal: Nature 20110505
Title: Biosynthesis of spinosyn in Saccharopolyspora spinosa: synthesis of permethylated rhamnose and characterization of the functions of SpnH, SpnI, and SpnK.
Journal: Journal of the American Chemical Society 20100310