(S)-1-((R)-1-Acryloylpiperidin-3-yl)-4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidine 1-oxide (Ibrutinib Impurity)

(S)-1-((R)-1-Acryloylpiperidin-3-yl)-4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidine 1-oxide (Ibrutinib Impurity)