CC(C)[C@]1(NC(=O)[C@@H]2C=C3c4cccc5[nH]cc(c45)C[C@H]3N(C)C2)O[C@@]2(O)[C@H]3CCCN3C(=O)[C@H](Cc3ccccc3)N2C1=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?