O=C(/C=C(\S/C=C(/c1ccccc1)N1CCn2c(C(=O)c3ccccc3)c(C(=O)c3ccccc3)c(C(=O)c3ccccc3)c21)C(=O)c1ccccc1)c1ccccc1
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.