Propionic acid (S)-1-((2S,4S,6R,8R,9S)-4-benzyloxy-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-ylmethyl)-2-methyl-allyl ester

2-[(1E,3E,7E)-(R)-9-((2S,4R,6S,8S,9R)-4-Hydroxy-8,9-dimethyl-1,7-dioxa-spiro[5.5]undec-2-yl)-1,5,7-trimethyl-nona-1,3,7-trienyl]-4-methoxy-5-methyl-benzoic acid methyl ester