COC1/C=C(C)/C=C/C(C)/C=C/C(=O)OC(/C(C)=C/C=C(\C)CNC(=O)[C@H](CO)NC=O)C(C)/C=C/C=C/C(OC)CC/C=C(C)/C=C/C1
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.