O=C(Cc1ccc(NC(=O)C2CCN(C(=O)C3CCCC3)CC2)cc1)Nc1cccc(C(=O)N2CCCCC2)c1
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?