CC[C@@]1(O)C[C@H](OC2CC(N(C)C)C(O)C(C)O2)c2c(O)c3c(c(O)c2[C@H]1OC1CC(N(C)C)C(O)C(C)O1)C(=O)c1cccc(O)c1C3=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?