COc1cc(C(C)c2cc3c(cc2OCCCCOc2cc4c(cc2C(C)c2cc(OC)c(OC)c(OC)c2)OCO4)OCO3)cc(OC)c1OC
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?