C=C(/C=C/C=C(\CO)CCC=C(C)C)[C@H]1CCC2([C@H]1O)[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.