(3aR,4S,6R,8S,9S,10R,11aS)-8,9-dihydroxy-6,10-dimethyl-3-methylene-2-oxododecahydro-6,9-epoxycyclodeca[b]furan-4-yl rel-2-methylpropanoate 2alpha-Hydroxytirotundin InChI=1/C19H28O7/c1-9(2)16(21)25-13-7-18(5)8-14(20)19(23,26-18)10(3)6-12-15(13)11(4)17(22)24-12/h9-10,12-15,20,23H,4,6-8H2,1-3,5H3/t10-,12+,13+,14+,15-,18+,19+/m0/s Isobutyric acid 1,13-dihydroxy-2,11-dimethyl-7-methylene-6-oxo-5,14-dioxa-tricyclo[9.2.1.0^(4,8)]tetradec-9-yl ester propanoic acid, 2-methyl-, (3aS,4R,6S,8R,9R,10S,11aR)-dodecahydro-8,9-dihydroxy-6,10-dimethyl-3-methylene-2-oxo-6,9-epoxycyclodeca[b]furan-4-yl ester