Synonyms: 11b,14c-Epoxy-2,14-(epoxymethano)benz[6,7]indeno[1,2,3-jk]benzofuro[5,4,3-efg][2]benzoxepin-4,6,16(1H,5cH)-trione,2,2a,4a,5,5a,5b,9,11,11a,11c,13,14,14a,14b-tetradecahydro-4a,11c-dihydroxy-2a,5c,14a-trimethyl-,[2R-(2a,2aa,4ab,5aa,5ba,5cb,11ab,11ba,11cb,14a,14ab,14bb,14ca)]-; Physalin R