1-NAPHTHALENECARBOXALDEHYDE, 6-[[(1,1-DIMETHYLETHYL)DIMETHYLSILYL]OXY]-5-[[[(1,1-DIMETHYLETHYL)DIMETHYLSILYL]OXY]METHYL]-3,4,4A,5,6,7,8,8A-OCTAHYDRO-5,8A-DIMETHYL-, (4AR,5R,6S,8AS)-