COC(=O)[C@H](Cc1ccccc1)NC(=O)N1CCCN(C(=O)N[C@@H](Cc2ccccc2)C(=O)OC)CCCN(C(=O)N[C@@H](Cc2ccccc2)C(=O)OC)CCC1
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.