COc1ccc2c(c1)[n+]([O-])c(C(=O)C/C(=N/OCCCc1ccccc1)C(=O)NC13CC4CC(CC(C4)C1)C3)c(C)[n+]2[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.