O=C1NC[C@H](Cc2ccccc2)N(C[C@@H]2CCCN2C[C@H](Cc2ccccc2)N2C[C@H](Cc3ccccc3)N(CC3CCCCC3)C(=O)C2=O)C1=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?