Chemical Name: 1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxopyrrolidin-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide
Synonym: Mirtazapine EP Impurity D ; Mirtazapine USP Related Compound A ; N-Desmethyl Mirtazapine ; 1,2,3,4,10,14b-Hexahydropyrazino[2,1-a]pyrido[2,3-c][2]benzazepine ; Desmethylmirtazapine