CCOC(=O)c1ccc(/N=C2\S/C(=C\C(=S)Nc3ccccc3)N(c3ccccc3)\C2=N/c2ccc(C(=O)OCC)cc2)cc1
PSA is a commonly used medicinal chemistry metric for the optimization of a drug's ability to permeate cells. Please predict psa of this molecule.