A conjugate of formula (A): Wherein Y is selected from formulae A1 and A2: Z1 is a C1-3 alkylene group; Z2 is a C1-3 alkylene group; Q is: where QX is such that Q is an amino-acid residue, a dipeptide residue or a tripeptide residue; L is a linker connected to a cell binding agent; CBA is the cell binding agent; and n is an integer between 0 and 48.
式(A)的共轭物:其中 Y 选自式 A1 和 A2: Z1 是 C1-3 亚烷基; Z2 是 C1-3 亚烷基; Q 是: 其中 QX 是这样的:Q 是
氨基酸残基、二肽残基或三肽残基;L 是与细胞结合剂相连的连接体;C
BA 是细胞结合剂;n 是 0 到 48 之间的整数。