
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1945
1952-3
1950
1949
1830 (original); 1967 (model)
1949
1948-1950
1950
1950
1949
1946
1944
1946-1948
1938 and 1951
1944-1945
1946
circa 1950
1948
1946
1948
1946
1950
1950
1947
1948
1955; 1830
2000-100 BCE
1947
circa 1950
1945-1948
1948
1949
1949
1950
1947
1949
1948
1947
1947-1948
1946-1948
1948
1948
1948
1950
1801-1892 (prepared); 1946 (element replaced)
4000-2001 BCE
1839 (original); circa 1988 (replica)
1944
circa 1947