COC(=O)C/C=C\[C@@H](C)[C@@H](/C=N\O[C@@H](C)c1cn([C@H](CO)Cc2ccccc2)nn1)OC
Molecules with a polar surface area of greater than 140 angstroms squared (Å2) tend to be poor at permeating cell membranes. What's the psa of this molecule?