
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1949
1945-1948
1949
1951
1950
1950
1947
1945
1947
2000-100 BCE
1948
1946
1945
1945
1951
1950-1952
1949
1948
1950
1948
1950
1955; 1830
1950
1952
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1952
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1938 and 1951
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circa 1950
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1951
1946-1948
1946
1950-1951
circa 1950
1948
1946
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1946
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1949
1801-1892 (prepared); 1946 (element replaced)