O=C(CNC(=O)OCc1ccccc1)NCCCCC(NC(=O)OCc1ccccc1)C(=O)NC(CCCCNC(=O)CNC(=O)OCc1ccccc1)C(=O)OCc1ccccc1
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?