CC1CC2CCC(O2)C(C)C(=O)OC(C)CC2CCC(O2)C(C)C(=O)OC(C)CC2CCC(O2)C(C)C(=O)OC(C)CC2CCC(O2)C(C)C(=O)O1
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.