CCCCS(=O)(=O)N1C2=NC(C(=O)OC)=C(C(=O)OC)[C@@H]3N(C)c4ccc(OC)cc4[C@]23C[C@H]1C(=O)OC
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.