Medchemexpress, HY-103618 10mg THZ531 CAS:1702809-17-3 THZ531 is a selective and covalent inhibitor of both CDK12 and CDK13 with IC50s of 158 nM and 69 nM, respectively. Purity:>98% Medchemexpress has over 10000 novel life-science reagents, reference compounds, APIs and natural compounds for laboratory and scientific use. Other quantity can also be offered.