1-Oxo Mirtazapine (Mirtazapine Impurity C);Mirtazapine Related Compound C (50 mg) (2-Methyl-3,4,10,14b-tetrahydrobenzo[c]pyrazino[1,2-a]pyrido[3,2-f]azepin-1(2H)-one);3,4,10,14b-Tetrahydro-2-Methyl-pyrazino[2,1-a]pyrido[2,3-c][2]benzazepin-1(2H)-one;Mirtazapine IMpurity C;Mirtazapine EP IMpurity C (USP RC C);Mirtazapine EP IMpurity C;Mirtazapine Related CoMpound C;2-Methyl-3,4,10,14b-tetrahydrobenzo[c]pyrazino[1,2-a]pyrido[3,2-f]azepin-1(2H)-one
