BD-9136 is a potent and highly selective BRD4 PROTAC depressant. BD-9136 has low-nanomolar degradation potencies against BRD4 , and its degradation selectivity for BRD4 is 1000 times that of BRD2 and BRD3 proteins. BD-9136 has antitumor activity.(Pink: Desmethyl-QCA276 ; Black: 3-(2-(4-Methylpiperazin-1-yl)ethyl)azetidin-3-ol; Blue: Thalidomide-4-OH )