Acetylene-linker-Val-Cit-PABC-MMAE consists the ADCs linker (Acetylene-linker-Val-Cit-PABC) and potent tubulin inhibitor (MMAE). Acetylene-linker-Val-Cit-PABC-MMAE is a agent-linker conjugate for ADC. Acetylene-linker-Val-Cit-PABC-MMAE is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.