The key step was a substrate controlled asymmetric heteroatom conjugated addition.关键反应为底物控制的不对称杂原子共轭加成反应....

heteroatom的音标：heteroatom的英式发音音标为：['hetərəʊætəm]heteroatom的美式发音音标为：['hetəroʊˌætəm]...

n.杂原子，杂环原子...