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Two peptoids that neutralize the Gram-negative lipopolysaccharide (LPS) were identified from the screening of a positional scanning library. The evaluation of the in vivo activity of these compounds in an endoxemia murine model is also reported. These peptoids did not neutralize lipid A, i.e., the hydrophobic toxic component of LPS. This fact suggests that they do not have access to the micellar core and that they should bind to the hydrophilic carbohydrate portion of LPS.