O=c1/c(=C/c2ccc(-c3ccc(Cl)cc3Cl)o2)sc2n1[C@@H](c1ccc3c(c1)OCO3)C=C(c1cc(F)c(Cl)cc1Cl)N=2
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.