BAY 1895344

New Drug Approvals

BAY-1895344 Structure

BAY 1895344

1876467-74-1 (free base)
(R)-3-methyl-4-(4-(1-methyl-1H-pyrazol-5-yl)-8-(1H-pyrazol-3-yl)-1,7-naphthyridin-2-yl)morpholine, monohydrochloride

BAY-1895344 hydrochloride Chemical Structure


Molecular Weight




BAY-1895344 (hydrochloride)


1876467-74-1(free base)


BAY-1895344 hydrochloride is a potent, orally available and selective ATR inhibitor, with IC50 of 7 nM. Anti-tumor activity.



Biological Activity

In vitro, BAY 1895344 was shown to be a very potent and highly selective ATR inhibitor (IC50 = 7 nM), which potently inhibits proliferation of a broad spectrum of human tumor cell lines (median IC50 = 78 nM). In cellular mechanistic assays BAY 1895344 potently inhibited hydroxyurea-induced H2AX phosphorylation (IC50 = 36 nM). Moreover, BAY 1895344 revealed significantly improved aqueous solubility, bioavailability across species and no activity in the hERG patch-clamp assay. BAY 1895344 also demonstrated very promising efficacy in monotherapy in DNA damage deficient tumor models as well as combination treatment with DNA damage inducing therapies.

Conversion of different model animals based…

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