Cephalexin. Molecular model of the antibiotic drug cephalexin (C16.H17.N3.O4.S), also spelled cefalexin. This is a first-generation cephalosporin antibiotic, used for bacterial infections such those of the middle ear, bone and joints, skin, and urinary tract. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and sulphur (yellow). Illustration.
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