A compound of formula (I) and salts and solvates thereof, wherein RL is a linker for connection to a cell binding agent, which is formula (IIa) wherein Q is a tripeptide residue of formula (A), where x is 1 or 2, -C(=O)-Qx-NH- is a dipeptide residue; X is: formula (B), where a = 0 to 5, b = 0 to 16, c = 0 or 1, d = 0 to 5; and GL is a linker for connecting to a Ligand Unit.
一种具有式(I)及其盐和溶剂化合物的化合物,其中RL是用于连接到细胞结合剂的连接剂,其为式(IIa),其中Q是式(A)的三肽残基,其中x为1或2,-C(=O)-Qx-NH-为二肽残基;X为:式(B),其中a = 0至5,b = 0至16,c = 0或1,d = 0至5;GL是用于连接到
配体单元的连接剂。