The present invention relates to Y-shape branched PEG derivatives of formulae (I) to (IV). The present invention also relates to conjugates of these Y-shape derivatives and drug molecules, pharmaceutical compositions comprising those conjugates.
本发明涉及式(I)到式(IV)的Y形分支P
EG衍
生物。本发明还涉及这些Y形衍
生物和药物分子的结合物,以及包含这些结合物的制药组合物。