The following data were obtained from experiments to find the molecular formula of procaine, a local anesthetic, which contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 3.54- sample of procaine with excess formed 8.58 and 2.70 . Another sample of mass 2.35 was found to contain 0.279 of . The molar mass of procaine was found to be 236. Find the molar formula of procaine. Express your answer as a chemical formula.