C[C@@]1(O)CC(=O)c2c(cc3ccc(-c4c5c(c(O)c6c(O)cccc46)C(=O)C[C@](C)(O)C5)c(O)c3c2O)C1
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.