COc1ccc(C(CC(=O)c2ccc(O)cc2)C(C(=O)c2ccc(O)cc2)C(c2ccc(OC)cc2)C2C(=O)NC(=S)NC2=O)cc1
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.