O=C(Nc1ccc2ccccc2c1)[C@@H]1C[C@H]1[C@@H](NP(=O)(c1ccccc1)c1ccccc1)c1ccccc1
Molecules with a polar surface area of greater than 60 angstroms squared (Å2) is hard to pass brain blood barrier. What's the psa of this molecule?