O=S(=O)(O)c1ccc2c(c1)-c1nc-2nc2[nH]c(nc3nc(nc4[nH]c(n1)c1ccc(S(=O)(=O)O)cc41)-c1ccc(S(=O)(=O)O)cc1-3)c1ccc(S(=O)(=O)O)cc21
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.