C[C@@H]1C[C@H](C)[C@@H](O)CC(=O)O[C@H]([C@H]2CCC[C@H]2C(=O)O)C/C=C/C=C(/C#N)[C@H](O)[C@@H](C)C[C@H](C)C1
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?