O=C1c2c(O)cc(O)cc2O[C@@]12c1c(cc(O)c3c1O[C@H](c1ccc(O)cc1)[C@@H](O)C3)O[C@@H]2c1ccc(O)cc1
Molecular masses are calculated from the standard atomic weights of each element. What is the molecular mass of this molecule?