摘要:
                                Water Soluble 5-O-(S-glutathionylthio)cysteinylmilbemycin D was successfully synthesized by using 3-nitro-2-pyridinesulfenyl (Npys) reagent through esterification of a Boc-cysteine derivative to a hydroxyl group at the C-5 position of milbemycin D, activation of the conventional S-protecting group, and asymmetrical disulfide bond formation.