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The general formula of a member of the penicillin family of antibiotics. Different penicillins have different chemical groups at the position marked "R."
Vancomycin -- one of the most important glycopeptide antibiotics. The blue tube represents the target peptide [D-ala-D-ala] to which it binds in bacterial cell walls. (Image taken from www.chm.bris.ac.uk/motm/vancomycin/text.htm).