O=C(O)CCCCCNC(=O)CCC(CN(CC(=O)OCc1ccccc1)CC(=O)OCc1ccccc1)N(CC(=O)OCc1ccccc1)CC(=O)OCc1ccccc1
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.