O=C(c1ccccc1)c1ccc(N2C(=O)/C(=C/c3ccccc3S)N=C2c2ccccc2)c(N2C(=O)/C(=C/c3ccccc3S)N=C2c2ccccc2)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.