COc1ccc([C@H]2[C@H](C(=O)C(C)(C)C)N3N=Cc4ccccc4C3[C@]23N=C(c2ccccc2)OC3=O)cc1OC
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?