苯硫酚 、
(3aR,6R,6aR)-6-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-3,3,6-trimethyl-5-oxo-tetrahydro-[1,2]oxathiolo[4,3-b]pyrrole-3a-carboxylic acid benzyl ester 以91%的产率得到(2R,3R,4R)-4-(1,3-Dioxo-1,3-dihydro-isoindol-2-yl)-2-(1-hydroxy-1-methyl-ethyl)-4-methyl-5-oxo-3-phenyldisulfanyl-pyrrolidine-2-carboxylic acid benzyl ester