The present invention is in the field of medicinal/pharmaceutical sciences. The present disclosure relates to compounds, compositions, methods, and uses for diagnosis and treatment of disease or conditions responsive to BRCA1 modulation, and/or the modulation of other proteins that contain BRCT domains. In particular, the invention relates to compound of formula I, corresponding compositions and methods for inhibiting BRCA1 activity and thereby DNA damage response (DDR) in cells, mediated via ATM, ATR, CDKs, DNA-PK, BRCA1, BRCA2, PALB2, RAD51 or CHEK1, as well as other molecules. Said modulation of steps in the DDR results in treatment or management of proliferative disorders including cancer.