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Conversion of 1 into picrotoxane sesquiterpenes 1a–e. Reagents and conditions: (a) acetic anhydride, pyridine, r.t.; (b) citrate buffer, β-glucocidase, rt; (c) Dess–Martin periodinane (DMP), DCM, r.t., 40 min; (d) 4 N HCl-dioxane (1:1), 100 °C, 2 h.
