C#CC1(O)C(COP(=O)(O)OCC2OC(n3ccc(NCCCCCCCCCCCCCCCCCC)nc3=O)C(O)C2O)OC(n2ccc(N)nc2=O)C1O
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.