O=C(c1ccccc1)c1sc2c(=O)c(C(=O)c3ccccc3)c(C(=O)c3ccccc3)sc2c(=O)c1C(=O)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?