Model of Penicillin G, made by Edward Abraham, University of Oxford, pre1970.

A hand-crafted wooden model of Penicillin G made by Edward Abraham, likely pre-1970. This beta-lactam structure was deduced by Edward Abraham and Ernst Chain from chemical degradation methods in 1943 and was later proven by Dorothy Hodgkin by X-Ray Crystallography in 1945. Edward Abraham worked with Howard Florey at the Sir William Dunn School of Pathology at the University of Oxford on the Development of Penicillin from January 1940.

There are two hydrogen atoms missing from the structure but and there are two loose hydrogen atoms with bond associated with it.