CC(C)=CCC/C(C)=C/C=C/C(C)=C/C1C[C@@]2(C(O)O1)[C@H](CCCO)/C(=C(/C)C=O)CC[C@]2(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.