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W-54011 is a potent non-peptide C5a receptor antagonist. W-54011 inhibits the binding of 125I-labeled C5a to human neutrophils (Ki = 2.2 nM). W-54011 inhibits C5a-induced intracellular Ca2+ mobilization, chemotaxis, and generation of ROS in human neutrophils (IC50s = 3.1 nM, 2.7 nM, and 1.6 nM, respectively).