The present invention provides a novel acid addition salt of 1-(5-(2,4-difluorophenyl)-1-((3-fluorophenyl)sulfonyl)-4-methoxy-1H-pyrrol-3-yl)-N-methylmethanamine. The above-described acid addition salt can have not only excellent proton pump inhibitory activity, gastric damage inhibitory activity and defensive factor-enhancing effect, but also excellent eradication activity against H. pylori and thus can be effectively used for the prevention and treatment of gastrointestinal injury due to gastrointestinal track ulcer, gastritis, reflux esophagitis, or H. pylori.本發明提供一種1-(5-(2,4-二氟苯基)-1-((3-氟苯基)磺醯基)-4-甲氧基-1H-吡咯-3-基)-N-甲基甲胺之新穎酸加成鹽。上述酸加成鹽不僅具有極佳質子泵抑制活性、胃損傷抑制活性及防禦因子增強效應，而且具有極佳之針對幽門螺旋桿菌(H.pylori)之根除活性，且由此可有效地用於預防及治療因胃腸道潰瘍、胃炎、逆流性食道炎或幽門螺旋桿菌所致之胃腸損傷。
