CC(=O)OCC1OC(ON=C2CC(O)C(O)C3C2CCC2C(=O)N(Cc4ccccc4)C(=O)C23)C(OC(C)=O)C(OC(C)=O)C1OC(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.