Sustained-release preparation

Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Particulate form

Reexamination Certificate

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C424S497000, C424S499000, C530S313000, C530S328000, C514S002600, C514S015800

Reexamination Certificate

active

07048947

ABSTRACT:
A sustained-release preparation which comprises a physiologically active peptide of general formulawherein X represents an acyl group;R1, R2and R4each represents an aromatic cyclic group;R3represents a D-amino acid residue or a group of the formulawherein R3′ is a heterocyclic group;R5represents a group of the formula —(CH2)n—R5′ wherein n is 2 or 3, and R5′ is an amino group which may optionally be substituted, an aromatic cyclic group or an O-glycosyl group;R6represents a group of the formula —(CH2)n—R6′ wherein n is 2 or 3, and R6′ is an amino group which may optionally be substituted;R7represents a D-amino acid residue or an azaglycyl residue; andQ represents hydrogen or a lower alkyl group, or a salt thereof and a biodegradable polymer having a terminal carboxyl group.The sustained-release preparation shows a constant release of the peptide over a long time and is substantially free from an initial burst.

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