Structure of Colchicine (1820-1945) H.CO OH OCH Stipitatic acid 密挤青霉酸 Windaus'proposed M.J.S.Dewar suggested 1942分离1945结构 1952 X-ray Confirmed Simon Zeisel (1854-1933) A.Windaus 1928 NP Michael James Steuart Dewar Proposed C22H2sNO in 1883 1876-1959 (1918-1997)