| abstract |
A compound or salt thereof having an affinity substance for an antibody, a cleaving moiety and a reactive group. The following formula (I): A-L-BR (I) [In the formula, A is an affinity substance for an antibody, L is a cleavable linker that is a divalent group containing a cleavable moiety. B is (a) a divalent group containing a bioorthogonal functional group, or (b) a divalent group not containing a bioorthogonal functional group. R is a reactive group for the antibody. ], And the affinity substance for the antibody is a polypeptide containing a glutamine residue (Q) at the N-terminal, a compound or a salt thereof. |