(E)-(6S,7S,12R)-12-[(E)-(1S,5R)-1,3-Dimethyl-5-((7R,9R)-9-methyl-6,10-dioxa-spiro[4.5]dec-7-yl)-hex-3-enyl]-6-hydroxy-7,9-dimethyl-oxacyclododec-9-en-2-one