COC(=O)C12OCC34C(CC5C(C)=CC(=O)C(O)C5(C)C3C(O)C1O)OC(=O)C(OC(=O)CC(C)C)C24
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.