Trichiol and 3-epitrichiol acetate, novel cytotoxic sterols with an unprecedented 2,6-dioxabicyclo[2.2.2]octan-3-one ring system from the myxomycete Trichia favoginea var. persimilis

Two new sterols, trichiol (R1 = OH, R2 = H), and 3-epitrichiol acetate (R1 = H, R2 = OAc) with a 2,6-dioxabicyclo[2.2.2]octan-3-one ring were isolated from the field-collected fruit bodies of myxomycete Trichia favoginea var. persimilis.