p-Nicorandil;2-IsonicotinaMidoethyl nitrate;N-(2-Nitrooxyethyl)isonicotinaMide;N-[2-(Nitrooxy)ethyl]-4-pyridinecarboxaMide;Nicorandil EP Impurity A (p-Nicorandil);Nicorandil Impurity 1(Nicorandil EP Impurity A);Nicorandil intermediate;4-Pyridinecarboxamide, N-[2-(nitrooxy)ethyl]-