(E)-1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)but-2-en-1-one 5g

(E)-1-((3aR,6S,7aS)-8,8-Dimethyl-2,2-dioxidohexahydro-1H-3a,6-methanobenzo[c]isothiazol-1-yl)but-2-en-1-one 5g