6(R)-[2-[8(S)-2-Meth
yl-d 3 -butyryloxy-2(S),6(R
)-dimethyl-1,2,6,7,8
, 8 d(R)-hexahydro-1(S)-
naphthyl]ethyl]-4(R)
-tert-butyldimethyls
ilyloxy-3,4,5,6-tetr
ahydro-2H-pyran-2-on
e
6(R)-[2-[8(S)-2-Methyl-d 3 -butyryloxy-2(S),6(R)-dimethyl-1,2,6,7,8, 8 d(R)-hexahydro-1(S)-naphthyl]ethyl]-4(R)-tert-butyldimethylsilyloxy-3,4,5,6-tetrahydro-2H-pyran-2-one
