The invention presents compounds of formula (I),
1
where R represents H or a suitable carboxylic acid protecting group, which are intermediates in the preparation of therapeutic fused bicyclic amino acids.
                            该发明提出了公式(I)的化合物,其中R代表H或适当的
羧酸保护基,这些化合物是制备治疗性融合双环
氨基酸的中间体。