2-pentulose, 3,4-anhydro-1,5-dideoxy-4-C-(4-methyl-3-pentenyl)- 3,4-anhydro-1,5-dideoxy-4-(4-methylpent-3-en-1-yl)pent-2-ulose InChI=1/C11H18O2/c1-8(2)6-5-7-11(4)10(13-11)9(3)12/h6,10H,5,7H2,1-4H