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(1R)-3-O-[(2E,4E)-7-((2R,3R)-3-{1-[(2R,3R)-3-allyl-1,4-dioxaspiro[4.4]non-2-yl]vinyl}-1,4-dioxaspiro[4.4]non-2-yl)-3-methylocta-2,4,7-trienoyl]-1,2-anhydro-4,5-dideoxy-1-[(1R)-1-methylbutyl]-4-prop-2-yn-1-yl-L-arabinitol