How To Use Five-membered In A Sentence

• It contains four oxazole and four thiazole rings and is representative of a broad class of pharmaceutically important natural products with five-membered heterocycles derived from peptide precursors.
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• The anchored ferrocene is a sandwich complex: two flat, five-membered carbon rings are the ‘bread’, while an iron atom in the middle serves as the filling.
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• Ozone attacks a carbon-carbon double bond, initially making an ozonide, a hair-raising five-membered ring that has three oxygens in a row.
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• The natural antibiotic, cephalosporin C, loses on hydrolysis an acetyl group to give the more stable Cc molecule with the carboxyl group combined in a five-membered lactone ring. Nobel Lecture The X-Ray Analysis Of Complicated Molecules
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