C[C@H](CCC(=O)NCCS(=O)(=O)[O-])C1CCC2C3C(C[C@H](O)C21C)C1(C)CC[C@@H](O)CC1C[C@H]3O.[Na+]
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?