(1'R,2'S,5'R)-menthyl (1S,4S,5S,6S)-5,6-(isopropylidenedioxy)-3-(2-pyridylthio)7-oxabicyclo<2.2.1>hept-2-ene-2-carboxylate

(1S,2S,6S,7S,8R)-4,4-Dimethyl-9-oxo-3,5,10-trioxa-tricyclo[5.2.1.02,6]decane-8-carboxylic acid (1R,2S,5R)-2-isopropyl-5-methyl-cyclohexyl ester