C=CCN1CC[C@@]23c4c5ccc(O)c4O[C@H]2/C(=N\N=C2/CC[C@@]4(O)[C@H]6Cc7ccc(O)c8c7[C@@]4(CCN6CC=C)[C@@H]2O8)CC[C@]3(O)[C@@H]1C5
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?