CCCCCCCCCC[C@H](O)[C@H]1CC[C@H]([C@H]2CC[C@H]([C@H](O)CC[C@H](O)CCCCCCC[C@@H](O)CC3=C[C@H](C)OC3=O)O2)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.