CCOC(=O)NC(=O)c1cn(-c2ccc(CCOC(=O)NCCCCCCNC(=O)OCCc3ccc(-n4c(=O)[nH]cc(C(=O)NC(=O)OCC)c4=O)cc3)cc2)c(=O)[nH]c1=O
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.