
Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1945
1952-3
1950
1949
1951
1830 (original); 1967 (model)
1949
1951
1948-1950
1950
1950
1949
1951
1946
1951
1944
1951
1951
1946-1948
1938 and 1951
1944-1945
1946
1950-1951
circa 1950
1948
1946
1948
1946
1950
1950
1947
1948
1955; 1830
2000-100 BCE
1951
1947
1951
circa 1950
1945-1948
1948
1949
1949
1950
1947
1949
1948
1947
1947-1948
1946-1948