O=C1C(c2ccccc2)=C(c2ccccc2)C(c2ccc(Cc3ccc(C4=C(c5ccccc5)C(=O)C(c5ccccc5)=C4c4ccccc4)cc3)cc2)=C1c1ccccc1
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.