Cefdinir- 13 C, 15 N 2 (FK-482- 13 C, 15 N 2 ) is 13 C and 15 N labeled Cefdinir. Cefdinir (FK-482) is a semi-synthetic, broad-spectrum antibiotic in the third generation of the cephalosporin class, which is proved to be effective for infections caused by several Gram-negative and Gram-positive bacteria. Cefdinir can be used for the research of common bacterial infections of the ear, sinus, throat, and skin.