1·We have made no reference to asymmetric carbon atoms.
我们未曾涉及不对称碳原子。
2·Many biologically important organic compounds (sugars and amino acids) possess at least one asymmetric carbon atom and therefore occur in two isomeric forms for the amino acid molecule.
许多对生物重要的有机化合物(糖和氨基酸)存在着至少一种非对称碳原子，并因此使这个氨基酸分子产生了两个同分异构体。
3·The methods of asymmetric construction of quaternary carbon centers and its applications to the synthesis of natural products have been reviewed.
综述了季碳的不对称构筑法及其在天然产物全合成中的应用。