O=C(Nc1ccc2c(c1)Cc1ccccc1-2)[C@@H]1[C@H](C(=O)O)[C@]2(Cl)C(Cl)=C(Cl)[C@@]1(Cl)C2(Cl)Cl
Molecular masses are calculated from the standard atomic weights of each element. What is the molecular mass of this molecule?