3-buten-2-one, 4-[(1S,4R,6R)-4-hydroxy-2,2,6-trimethyl-7-oxabicyclo[4.1.0]hept-1-yl]-, (3E)- 3beta-Hydroxy-5alpha,6alpha-epoxy-7-megastigmen-9-one 4-(4-Hydroxy-2,2,6-trimethyl-7-oxa-bicyclo[4.1.0]hept-1-yl)-but-3-en-2-one InChI=1/C13H20O3/c1-9(14)5-6-13-11(2,3)7-10(15)8-12(13,4)16-13/h5-6,10,15H,7-8H2,1-4H3/b6-5+/t10-,12-,13+/m1/s rel-(3E)-4-[(1R,4S,6S)-4-hydroxy-2,2,6-trimethyl-7-oxabicyclo[4.1.0]hept-1-yl]but-3-en-2-one