Cc1cc(=O)oc2cc(NC(=O)[C@H](CCCCN)NC(=O)[C@H](CC3CCCCC3)NC(=O)OCC3c4ccccc4-c4ccccc43)ccc12
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.