(2E)-4-[3-[(1E)-hept-1-en-1-yl]-5-hydroxy-4-(hydroxymethyl)-2-oxo-7-oxabicyclo[4.1.0]hept-3-en-1-yl]-2-methylbut-2-enoic acid 2-butenoic acid, 4-[3-[(1E)-1-heptenyl]-5-hydroxy-4-(hydroxymethyl)-2-oxo-7-oxabicyclo[4.1.0]hept-3-en-1-yl]-2-methyl-, (2E)- 4-(3-Hept-1-enyl-5-hydroxy-4-hydroxymethyl-2-oxo-7-oxa-bicyclo[4.1.0]hept-3-en-1-yl)-2-methyl-but-2-enoic acid Ambuic acid InChI=1/C19H26O6/c1-3-4-5-6-7-8-13-14(11-20)15(21)17-19(25-17,16(13)22)10-9-12(2)18(23)24/h7-9,15,17,20-21H,3-6,10-11H2,1-2H3,(H,23,24)/b8-7+,12-9