COc1cccc(-c2nc3c(c(SCC(=O)Nc4cc(C)ccc4C)n2)Cc2c(CO)cnc(C)c2O3)c1
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?