| http://www.w3.org/ns/prov#value | - The sustained releasing drug wherein the copolymer is represented by the following structural formula (13), which is obtained from the copolymer of claim 5, wherein p, r and s are each 0 or a positive integer, provided that three of p, r and s are not simultaneously 0; q is an integer of 0 or a positive integer, (p+r+s)/(q+1) is in the range of 2 to 100; and R is a hydrogen atom or a methyl group;
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