CC1=CC2C3(C)C(C)(C(C)=CP3(=O)c3c(C(C)C)cc(C(C)C)cc3C(C)C)C1P2(=O)c1c(C(C)C)cc(C(C)C)cc1C(C)C
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.