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; inhibits ATR kinase-dependent CHK1 phosphorylation in cells (IC50=74 nM); enhances the therapeutic efficacy of cisplatin in xenograft models; orally active and bioavailable.Gastric Cancer Phase 2 Clinical; Purity: >98% (HPLC); Molecular Weight: 412.5085, 5 mg