CN1C[C@@H](C(=O)N[C@@]2(C)O[C@]3(O)[C@H]4CCCN4C(=O)[C@@H](Cc4ccccc4)N3C2=O)C=C2c3cccc4[nH]cc(c34)C[C@@H]21
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?