Chemical Name: 1-(4-methoxyphenyl)-7-oxo-6-(4-(2-oxoazepan-1-yl)phenyl)-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxamide
Synonym: Mirtazapine EP Impurity C ; Mirtazapine USP RC C ; Mirtazapine Lactam ; 2-Methyl-3,4,10,14b-tetrahydrobenzo[c]pyrazino[1,2-a]pyrido[3,2-f]azepin-1(2H)-one ; 1-Ketomirtazapine ; 10-Ketomirtazapine