[(1S,3S,7S,8R,8aS)-8-[2-[(2R,4R)-4-hydroxy-6-oxo-oxan-2-yl]ethyl]-3,7- dimethyl-1,2,3,7,8,8a-hexahydronaphthalen-1-yl] 2-ethyl-2-methyl-butan oate