ca H OH 鞯oLCH3 CH2CHCHCHO CH3 _△CH3CH2CH=CCH0 CH3 C H 3 C H 2 C H C C H O C H 3 CH3 CHCHO + CH3 CH2 C H H O O H C H3 C H2 CH CH CH O O H￾C H3 稀