Novo Nordisk agreed on September 25 to pay Nanexa up to 1.165 billion euros for PharmaShell, an atom-thin coating that meters a drug particle's release so an injection can last a month or a quarter instead of a week. The target it names is not a new receptor but a calendar. It signals where the obesity race has moved: the molecules are settled, and the gains left are in getting people to stay on them.