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MC-Ala-Ala-Asn(Trt)-PAB, is a hetero bifunctional cross-linker, useful in antibody drug conjugation (ADC). MC-Ala-Ala-Asn(Trt)-PAB is a fissionable linker which is specifically activated in a tumor microenvironment. XQN70430 was reported in patent WO 2016026458.