COc1ccc(/N=C(/[N-]n2c(=O)c(C)nn(C)c2=S)N(c2ccc(OC)cc2)c2n[n+]3c(=O)c(C)nn(C)c3s2)cc1
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.