CC(=O)OC[C@@H]1O[C@H](C/C=N\O[C@@H](C)c2cn([C@H]3COC[C@H]3O)nn2)C=C[C@@H]1OC(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.