• The molecular formula C9H13NO3 (molar mass: 183.20 g/mol, exact mass: 183.089543) may refer to: Adrenaline, also known as epinephrine Ginkgotoxin Nordefrin (Corbadrine, Levonordefrin), a catecholamine Normetanephrine 2,4,5-Trihydroxyamphetamine This set index page lists chemical structure articles associated with the same molecular formula. (wikipedia.org)