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1·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。