6(S)-methyl-7(R)-<(tert-butyldimethylsilyl)oxy>-8(S)-methyl-9-(S)<(methoxyethoxymethyl)oxy>deca-2,4-dienal

10(S)-methyl-11(R)-<(tert-butyldimethylsilyl)oxy>-12(S)-methyl-13(S)<(methoxyethoxymethyl)oxy>tetradeca-2,4,6,8-tetraenal