COc1cc2c(cc1OCCCC(=O)Nc1cc(C(=O)Nc3cc(C(=O)NCCCN(C)C)n(C)c3)n(C)c1)N=C[C@@H]1CCCN1C2=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.