"Ernst Boris Chain" is a proper noun, specifically the name of a British biochemist who was originally from Germany. He is known for his significant work in the field of biochemistry, particularly for isolating and purifying penicillin. Penicillin is an antibiotic that helps fight bacterial infections and was first discovered in 1928 by another scientist named Sir Alexander Fleming.
Ernst Boris Chain is an important historical figure in the field of biochemistry, known for his work on penicillin.