N-(3-(Dibenzo[b,e]oxepin-11(6H)-ylidene)propyl)-N-methylnitrous amide; N-Nitroso Nordoxepin; N-(3-(Dibenzo[b,e]oxepin-11(6H)-ylidene)propyl)-N-methylnitrous amide; (E)-N-(3-(dibenzo[b,e]oxepin-11(6H)-ylidene)propyl)-N-methylnitrous amide; N-Nitroso Doxepin EP Impurity C