Compound 11 alleviates acid‐induced nocifensive behaviors. Pain‐related behaviors as determined by the time spent for following saline, acetic acid (0.6%, pH 3.5~4.0), or acetic acid plus EGCG (compound 11, 100 μmol/L). n = 7 each group. ***P < 0.001, compared with saline; #P < 0.05, compared with acetic acid; unpaired Student's t test