New Drug Complex

Abstract: The present invention provides a novel copolymer utilizable for drug delivery technology. The present invention pertains to a drug complex in which a target recognition molecule is bound to a copolymer X comprising structural units represented by the following formulae (a), (b) and (c). [In the formulae, R1, R2, and R3 are the same or different and each represent a hydrogen atom or a C1-3 alkyl group; R4 represents a C1-3 alkyl group; R5 represents a hydrogen atom, a C1-18 alkyl group, an optionally substituted, 3- to 8-membered cycloalkyl group, an adamantyl group, an optionally substituted C6-18 aryl group, or an optionally substituted, 5- to 10-membered heteroaryl group; X1, X2, and X3 are the same or different and each represent an oxygen atom, a sulfur atom, or N-R7; R6 represents a hydrogen atom, a leaving group, or a linker; R7 represents a hydrogen atom or a C1-3 alkyl group; m is an integer of 1-100; and n is an integer of 0-3.]

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