
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1942
1938
1940
1938
1945
1940
1940-1945
1937-1938
1939-1945
1943
1940
1938
1937-1937
1937-1938
1945
1943
1936
1937
1938
1936
1937
1944
circa 1942
1939
1936
1944-1945
1940
2000-100 BCE
1938
1938
1938
1938
1940
1942
1938-1940
1938
1938
1955; 1830
1942
1940-1944
1938 and 1951
1936
1940
1943
circa 1940
1942-1945
1937
1937
1839 (original); circa 1988 (replica)