1828 - Aleksandr Mikhaylovich Butlerov was born.

Butlerov was a Russian chemist who first stated the importance of a chemical's structure. He stated that a chemical's nature was determined not only by it's components but the arrangement of the components. He was also the first to recognize double bonds in chemical structures. Butlerov discovered formaldehyde and the formose reaction where sugars are formed from formaldehyde.