(S)-1-(1,4-Dioxa-spiro[4.5]dec-2-yl)-pent-4-en-2-one

(S)-2-[(S)-2-(4-Methoxy-benzyloxy)-pent-4-enyl]-1,4-dioxa-spiro[4.5]decane

(R)-(S)-1-(1,4-Dioxa-spiro[4.5]dec-2-yl)-pent-4-en-2-ol

(2S)-1[(2S)-1,4-dioxaspiro[4.5]decan-2-yl]pent-4-en-2-ol