H H H 乙烯 α-蒎烯 Ethlyene a-Pinene ①D β-胡萝卜素 ⑨D β- CaroteneOrganic Chemistry Organic Chemistry Xiamen Xiamen University University C C H H H H 乙烯 α−蒎烯 β−胡萝卜素 E thlyene α-Pinene β-Caro tene