ethyl 6-(1,3-dithian-2-yl)hex-2-enoate

1-(1-吡咯烷)环戊烯

2-氧代-2-(2-氧代环戊基)乙酸乙酯

3-benzyloxy-6-bromo-4-hydroxybenzaldehyde

(E)-6-(Ethoxycarbonyl)-5-hexenoic acid