physalin

physaline

(14R,16β,22R,25S)-14,17:14,27-Diepoxy-5,7α,13,20,22-pentahydroxy-1,15-dioxo-16,24-cyclo-13,14-seco-5α-ergost-2-ene-18,26-dioic acid 18,20:26,22-dilactone