O=C(O)/C=C\C(=O)O.O=C1NCN(c2ccccc2)C12CCN(CCCN1CCN(CCOC(c3ccccc3)c3ccccc3)CC1)CC2
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.