In a preferred embodiment, there is provided a protecting group for protecting the thiol side chain of a cysteine residue, the protecting group comprising a Diels-Alder cycloadduct of a furan and a maleimide, and optionally, a linker interposed between the thiol side chain and the Diels-Alder cycloadduct.
在一种优选实施方式中,提供了一种保护基团,用于保护半胱
氨酸残基的
硫醇侧链,所述保护基团包括
呋喃和马来
酰亚胺的二烯-阿尔德环加成物,以及可选地,插入在
硫醇侧链和二烯-阿尔德环加成物之间的连接剂。