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Novel rhodesain inhibitors were obtained by combining an enantiomerically pure 3‐bromoisoxazoline warhead with a specific peptidomimetic recognition moiety. All derivatives behaved as inhibitors of rhodesain, with low micromolar K_i values. Their activity against the enzyme was found to be paralleled by an in vitro antitrypanosomal activity, with IC₅₀ values in the mid‐micromolar range. Notably, a preference for parasitic over human proteases, specifically cathepsins B and L, was observed.