CC(=O)OC[C@@H]1O[C@@H](O/N=C2/C[C@@H](O)[C@@H](O)[C@@H]3[C@@H]4C(=O)N(C(C)(C)C)C(=O)[C@H]4CC[C@@H]23)[C@H](OC(C)=O)[C@H](OC(C)=O)[C@@H]1OC(C)=O
The polar surface area (PSA) or topological polar surface area (TPSA) of a molecule is defined as the surface sum over all polar atoms or molecules, primarily oxygen and nitrogen, also including their attached hydrogen atoms. PSA is a commonly used medicinal chemistry metric for the optimization of a drug's ability to permeate cells. Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. How much is the polar surface area of this molecule?