Claiming it would be impossible to carve out a so-called skinny label that would comply with generic drug “same labeling” rules, Novartis AG is petitioning the U.S. FDA, for the second time, not to approve generic versions of its blockbuster heart drug, Entresto (sacubitril + valsartan), that attempt to carve around a cardiovascular indication that has exclusivity until Feb. 16, 2024.