(S)-Ceralasertib ((S)-AZD6738) is extracted from patent WO2011154737A1, Compound II, exhibits an IC50 of 2.578 nM.(S)-Ceralasertib is a potent and selective sulfoximine morpholinopyrimidine ATR inhibitor with excellent preclinical physicochemical and pharmacokinetic (PK) characteristics.(S)-Ceralasertib is developed improving aqueous solubility and eliminates CYP3A4 time-dependent inhibition[2].