
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1942
1943
1945
1830 (original); 1967 (model)
1839 (original); circa 1988 (replica)
1940
1952-3
1938
1947
1938
1938
1938
1940
1940
1938
1938
1940-1945
1945
1946
1943
1955; 1830
1938 and 1951
1944-1945
1940-1944
1943
1942
1942
1946
1944
circa 1942
1939
1946
2000-100 BCE
1938-1940
1939-1945
1946
1940
1947
1940
1938
1938
1946
1938
1938
1940
1939
1990-96
1940
1801-1892 (prepared); 1946 (element replaced)