COc1ccc2c3c1O[C@H]1C(OC)C=CC4C(C2)N(Cc2cccs2)CCC341.O=C(O)/C=C/C(=O)O
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?