(2R,6R)-2-[(E)-(S)-1,3-Dimethyl-4-(toluene-4-sulfonyl)-but-1-enyl]-6-ethyl-5-methyl-3,6-dihydro-2H-pyran

(2S,6S)-6-ethyl-5-methyl-3,6-dihydro-2H-pyran-2-yl carboxylic acid