The present disclosure provides drug-ligand conjugates and drug-cleavable substrate conjugates that are potent cytotoxins. The disclosure is also directed to compositions containing the drug-ligand conjugates, and to methods of treatment using them.本揭示提供屬於強力胞毒素之藥物-配體綴合物及藥物-可裂解基質綴合物。本揭示也針對含有該藥物-配體綴合物之組成物及使用該等組成物之治療方法。