2,4,14-Pentadecatrienoic acid,8,9,11,12-tetrahydroxy-3-methyl-7,10-bis(methylene)-,(1S,2R)-2-methyl-1-[(2R,3S)-3-[(1S)-1-methylbutyl]oxiranyl]-4-pentynylester, (2E,4E,8R,9R,11R,12R)-