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He approached the task in a systematic way, developing methods to make one part of the molecule at a time. While working on synthesizing penicillin, he learned enough about the reactions of the different chemical groups of penicillin to be able to form new synthetic derivatives of penicillin that could be used to treat particular diseases. The beta-lactam ring of penicillin plays a key role in the antibiotic. It is also a chemical structure that, if opened, deactivates penicillin. One of the major problems Sheehan faced in the synthesis of penicillin was putting together the elements of penicillin’s two rings and then closing the beta-lactam ring. Adding the remainder of the molecule without opening the beta-lactam ring was another problem for Sheehan and his research team. Sheehan first worked on forming amide bonds.
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