physalin F

(14S,16β,22R,25S)-5,6β:14,17:14,27-Triepoxy-13,20,22-trihydroxy-1,15-dioxo-16,24-cyclo-13,14-seco-5β-ergost-2-ene-18,26-dioic acid 18,20:26,22-dilactone