AZD-6738 (AZD6738, Ceralasertib) is a potent and selective inhibitor of ATR with IC50 of 1 nM; shows no significant activity for ATM, DNA-PK and mTOR.

BAY-1895344 is a potent, selective, orally active ATR inhibitor with low-nanomolar potency; potently inhibits the proliferation of a broad spectrum of human tumor cell lines with mean IC50 of 78 nM; inhibits hydroxyurea-induced H2AX phosphorylation, exhibits strong in vivo anti-tumor efficacy in monotherapy in a variety of xenograft models.Blood Cancer,Phase 1 Clinical

KU-60019 is an improved analogue of KU-55933, and is a potent, specific inhibitor of ATM kinase with IC50 of 6.3 nM, 270- and 1,600-fold selectivity over DNA-PKcs and ATR.