CC1(C)NC(=O)C(NC(=O)C(CC(=O)OCc2ccccc2)NC(=O)OCc2ccccc2)CCCCNC(=O)CCNC1=O
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?