作者: Yoshiharu Ikeda , Keiichi Ono , Yoshiyuki Kai
DOI:
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摘要: Polyethylene glycol derivatives of the formula ##STR1## wherein R 1 and 2 are same or different each represents a lower alkyl, m n positive integer p is 0 integer, peptides modified by polyethylene derivatives, methods for producing them use peptides. The (I) invention, as compared with corresponding non-modified peptides, show decreased antigenicity, considerably delayed in biological clearance, exhibit their physiological activities effectively over long period, rendering very effective pharmaceuticals well drugs animals.