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Chitin molecule. Structural chemical formula and molecule model. Sheet of paper in a cage Chitin, chemical structure. Chitin is a polymer of N-acetylglucosamine and is present in the exoskeletons of insects, crustaceans, etc. Skeletal formula. The tanner or the sawyer Chitin molecule  chitin Ground shrimp isolated on white background cockleshell Food scraps from Shrimp peeled on the plastic plate The stag beetle crab Procambarus clarkii with white background Chitin, chemical formula and structure. Long chain polymer of N-acetylglucosamine, 2nd most abundant polysaccharide in nature after cellulose. Primary component of cell walls in insect exoskeletons. käfer