Neurotransmitters are important chemicals in the brain that assist in the firing of neurons. Norephinephrine is a neurotransmitter that is released in the body when the body is threatened or depressed. It contains 56.8 percent carbon, 6.5 percent hydrogen, 28.4 percent oxygen, and 8.3 percent nitrogen. It has a molar mass of 169 g/mole. What is its molecular formula?​