Word: sulfaquinoxa
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...long line of sulfas. Other companies were the first to find high-powered, patentable variants like sulfamerazine, sulfadiazine, sulfathiazole and sulfaguanidine. Merck chemists got what looked like a dud: sul-faquinoxaline. Never proved safe for human use, it might have been shelved. Then animal tests showed that sulfaquinoxa-line is wonderful for protecting chickens against coccidiosis, a deadly parasitic disease. By now, the sulfas have been largely superseded by newer and better drugs (mainly antibiotics) for humans, but so far nobody has found anything better than Merck's sulfa for sick chicks...
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