CC[C@]1(c2ccc3c(c2)OCO3)C=[N+]([O-])O[C@H](OC2CCCC2(c2ccccc2)c2ccccc2)[C@@H]1OC(C)=O
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.