O=c1cc(-c2ccccc2)oc2cc(OCCSCCCCCCCCCCSCCOc3ccc4c(=O)cc(-c5ccccc5)oc4c3)ccc12
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?