CC1(C)O[C@@H](CP(c2ccc3ccccc3c2)c2ccc3ccccc3c2)[C@H](CP(c2ccc3ccccc3c2)c2ccc3ccccc3c2)O1
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?