Cc1ccc(C(=O)N[C@@H](C)CN2C3=NC[C@H](C)N3C[C@H]2Cc2ccc(O)cc2)cc1Br
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?