CCCNC(=O)Cn1c(=O)/c(=C/c2ccc(-c3ccc([N+](=O)[O-])cc3)o2)s/c1=C\C(=O)C(C)(C)C
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.