STAT3 degrader-2 is a PROTAC-based degrader of STAT3. STAT3 degrader-2 can degrade the level of total STAT3 protein. STAT3 degrader-2 can be used for the research of cancer and other diseases. STAT3 degrader-2 is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.