Alexander Mikhaylovich Butlerov (Алекса́ндр Миха́йлович Бу́тлеров; September 15, 1828 – August 17, 1886) was a Russian chemist, one of the principal creators of the theory of chemical structure (1857–1861), the first to incorporate double bonds into structural formulas, the discoverer of hexamine (1859), the discoverer of formaldehyde (1859) and the discoverer of the formose reaction (1861).