Tofacitinib Impurity 43

Chemical Name: (3R,4S)-4-Methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-1-piperidinepropanenitrile+(3S,4R)-4-Methyl-3-(methyl-7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-β-oxo-1-piperidinepropanenitrile

Smile: C[C@H]1[C@H](N(C2=NC=NC3=C2C=CN3)C)CN(C(CC#N)=O)CC1.C[C@@H]4[C@H](N(C5=NC=NC6=C5C=CN6)C)CN(C(CC#N)=O)CC4