O=C(C1=C[C@@H]2[C@H]3C(=O)N(c4ccccc4Cl)C(=O)[C@H]3[C@@H](C(=O)c3ccc(Cl)cc3)N2C=C1)c1ccccc1
Molecular masses are calculated from the standard atomic weights of each element. What is the molecular mass of this molecule?