O=C(Oc1cc(OC(=O)c2ccccc2)c2c(c1)OC(c1ccc(OC(=O)c3ccccc3)c(OC(=O)c3ccccc3)c1)[C@@H](OC(=O)c1ccccc1)C2)c1ccccc1
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.