(2S,4aα,8aβ)-3,4,4a,5,6,7,8,8a-Octahydro-2,7β-dihydroxy-7α-(hydroxymethyl)-4α-(3-hydroxy-1-oxopropyl)-2,4β,5α-trimethyl-3α-[(R)-1-methylpropyl]-1(2H)-naphthalenone