Nicorandil Impurity 2;2-aminoethyl nicotinate nitrate;2-aminoethyl nicotinate;Nicorandil EP Impurity C;Nicorandil Impurity 3 Nitrate(Nicorandil EP Impurity C Nitrate);Nicorandil EP Impurity C Nitrate;Nicorandil Impurity 2 Nitrate;2-Aminoethyl Nicotinate Nitrate Salt