C#C[C@]1(O)CC[C@H]2[C@@H]3CCC4=Cc5nc6nc7ccccc7n6cc5C[C@]4(C)[C@H]3CC[C@@]21C
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?