(1S*,2R*)-cis-bicyclo<3.3.0>oct-3,7-diene-2-spiro-4'-<(α,α-bis(phenylsulfenyl))-γ-butyrolactone>
(1S*,2R*)-cis-bicyclo<3.3.0>oct-3,7-diene-2-spiro-4'-<α-(1-hydroxyethyl)-α-(Phenylsulfenyl)-γ-butyrolactone>
(1S*,2R*)-exo-3-(phenylselenenyl)-cis-bicyclo-<3.3.0>-oct-7-ene-2-spiro(2'-oxocyclobutane)