O=C(Cc1cccc(NC(=O)C2CCCN(C(=O)C3CCCCC3)C2)c1)Nc1cccc(C(=O)N2CCCCC2)c1
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?