O=C(Nc1ccc(Cl)cc1Cl)C1C(=O)N(c2ccc(Cl)cc2Cl)C(=O)/C1=N\Nc1ccc([N+](=O)[O-])cc1[N+](=O)[O-]
Molecular masses are calculated from the standard atomic weights of each element. What is the molecular mass of this molecule?