SCP1-IN-1 (compound SH T-62) is a potent and selective covalent inhibitor against SCP1. SCP1-IN-1 promotes REST degradation and reduces transcriptional activity. A high level of REST protein drives the tumor growth in some glioblastoma cells. SCP1-IN-1 has the potential for the research of glioblastoma whose growth is driven by REST transcription activity.