1-[(2R,3S)-3-((E)-2-Methyl-buta-1,3-dienyl)-1,4-dioxa-spiro[4.5]dec-2-yl]-ethanone

(E)-3-((2S,3S)-3-Hydroxymethyl-1,4-dioxa-spiro[4.5]dec-2-yl)-2-methyl-propenal