[1S-(1α(4S,5R),3α,4β,5α,6α,7β)]-1-(4-hydroxy-5-methyl-3-methylene-6-phenylhexyl)-4,6,7-trihydroxy-2,8-dioxabicyclo[3.2.1]octane-3,4,5-tricarboxylic acid 3,4,5-tris(1,1-dimethylethyl) ester