2(R)methyl-3(R)-<(tert-butyldimethylsilyl)oxy>-4(S)-methylhex-5-enal

3(S)-methyl-4(R)-<(tert-butyldimethylsilyl)oxy>-5(S)-methyl-6-(S)-<(methoxyethoxymethyl)oxy>hept-1-ene