(3-​(4-​Phenoxyphenyl)​-​1-​[(3R)​-​1-​(phenylmethyl)​-​3-​piperidinyl]​-1H-​pyrazolo[3,​4-​d]​pyrimidin-​4-​amine is an intermediate in synthesizing Ibrutinib-d4 (I124971), a labelled analogue of Ibrutinib (I124970). Ibrutinib is a highly selective Bruton’s tyrosine kinase (Btk) irreversible inhibitor.