CC1(C)CC(=O)c2c(nc3ccc4ccccc4c3c2-c2ccc(NC(=O)CCCC(=O)Nc3ccc(-c4c5c(nc6ccc7ccccc7c46)CC(C)(C)CC5=O)cc3)cc2)C1
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?