2-<(2S,4R,6R,8R,9S)-4-<(tert-butyldiphenylsilyl)oxy>-8,9-dimethyl-1,7-dioxaspiro<5.5>undecyl>ethanal

2-<(5R)-9-<(2R,4R,6R,8R,9S)-4-hydroxy-8,9-dimethyl-1,7-dioxaspiro<5.5>undec-1-yl>-1,5,7-trimethyl-1(E),3(E),7(Z)-nonatrien-1-yl>-4-methoxy-5-methylbenzoic acid