C#CC1(O)CCC2C3CCc4cc(Oc5nc(F)nc(-c6c7ccccc7c7n6CCS7)n5)ccc4C3CC[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?