BRC50: Baricitinib Lactone Impurity

N-((3-(4-(3H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl)-5-oxo-tetrahydrofuran-3-yl)methyl) ethanesulfonamide ;   

CAS # 2910813-43-1 ;

C16H18N6O4S ;
Mol. Wt.: 390.42 ;