5H-2,11a-Ethanobenzo[5,6]cyclodec[1,2-b]oxirene-5,12-dione, 8-(acetyloxy)dodecahydro-11-hydroxy-5a,9,9-trimethyl-13-methylene-, [1aR-(1aR*,2S*,5aR*,8S*,9aR*,11R*,11aR*)]- 83159-27-7 Epoxyshikoccin NSC607642