
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1942
1938
1940
1938
1945
1948
1946
1943
1948
2000-100 BCE
1945
1947
1940
1942
1946
1938-1940
1940
1936
1938
1938
1948
1940-1945
1942
circa 1942
circa 1938
1939
1936
1946-1948
1938 and 1951
1944-1945
1936
1946
1940
1938
1947
1938
1948
1938
1938
1940
1937-1937
1955; 1830
1937-1938
1937-1938
1948
1944
1938
1939-1945
1943