A reagent having the general formula of General Formula I:
1
wherein group Z comprises a spacer selected from an aliphatic chain up to about 6 carbon equivalents in length, an unbranched aliphatic chain of from about 6 to 18 carbon equivalents in length with at least one of an intermediate amide and a disulfide moiety, and a polyethylene glycol chain of from about 3 to 12 carbon equivalents in length; wherein group R is an electrophilic or nucleophilic moiety suitable for reaction of the reagent with a biologically active species; and wherein group Q is one of nothing at all, an amide, a methyl amide, a methylene, an ether, a thioether, a methyl ether, and a methyl thioether moiety. Also, a conjugate, a bioconjugate and a method of conjugating.
                            一种具有通式I的试剂:其中Z基包括从长达约6个碳当量的脂肪链、从大约6到18个碳当量的直链脂肪链,其中至少有一个中间酰胺和二
硫键基团,以及从大约3到12个碳当量的聚
乙二醇链;其中R基是适用于试剂与
生物活性物种反应的亲电或亲核基团;而Q基是无、酰胺、甲基酰胺、亚甲基、醚、
硫醚、甲基醚和甲基
硫醚基团之一。此外,还提供了一种共轭物、
生物共轭物和共轭方法。