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Abdominal constrictions induced by acetic acid (0.8% in saline) in mice previously administered (30 min) i.p. with control vehicle (10 mL.kg-1), or compounds C1 and C2 (dose-response). Results expressed as mean ± SEM of up to 8 animals for experimental groups (**p ≤ 0.01; ***p ≤ 0.001).
