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(S)-Ibutinib (S)-Ibrutinib (S)-Ibrutinib-d5 Ibrutinib (S)-Isomer Ibrutinib iMpurity SYG (S)-1-(3-(4-amino-3-(4-phenoxyphenyl) 1-[(3S)-3-[4-amino-3-(4-phenoxyphenyl)pyrazolo[3,4-d]pyrimidin-1-yl]piperidin-1-yl]prop-2-en-1-one (S)-1-(3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidin-1-yl)prop-2-en-1-one 2-Propen-1-one, 1-[(3S)-3-[4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]-1-piperidinyl]- (S)-1-(3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidin-1-yl)prop-2-en-1-one? (Ibrutinib Impurity） Ibrutinib impurity 2/(S)-Ibrutinib/(S)-1-(3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl)piperidin-1-yl)prop-2-en-1-one