CCOC(=O)NC(=O)c1cn(CCCOC(=O)CCCCCCCCC(=O)OCCCn2cc(C(=O)NC(=O)OCC)c(=O)[nH]c2=O)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.