The invention provides an antibody drug conjugate and a method for using the antibody drug conjugate, which comprises an antibody conjugated to a drug module of 1 - (chloromethyl) - 2,3-dihydro-1h-benzo [e] indole (CBI) dimer via a connector.本發明提供抗體‑藥物綴合物及使用抗體‑藥物綴合物的方法,該抗體‑藥物綴合物包含經接頭綴合至1‑(氯甲基)‑2,3‑二氫‑1H‑苯并 [e]吲哚(CBI)二聚體藥物模塊的抗體。