2,10-Methano-1H-benzo[b]cyclopent[f]oxepin-5-carboxaldehyde,2,3,3a,9,10,10a-hexahydro-6,8-dihydroxy-1,1,10a-trimethyl-7-(3-methyl-1-oxobutyl)-,(2a,3ab,10a,10ab)-(+)-