O=C1c2ccccc2C(=O)c2c1ccc(C1C(=O)c3ccccc3C1=O)c2-c1c(C2C(=O)c3ccccc3C2=O)ccc2c1C(=O)c1ccccc1C2=O
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?