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(2R,6S,7R,9S,10S)-10-Benzoyloxy-5-[(2E,6E)-(R)-8-((2R,4S,6R,8R,9S)-4-benzoyloxy-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-yl)-4,6-dimethyl-octa-2,6-dien-(E)-ylidene]-9-methyl-2-phenyl-1,3-dioxa-spiro[5.5]undecane-7-carboxylic acid