1. Means for suppressing transient relaxation of the lower esophageal sphincter containing 4 - [({6- [isobutyl (1,3-thiazol-2-ylsulfonyl) amino] -2,3-dihydro-1H-inden-5-yl} oxy) methyl] -3-methylbenzoic acid, its salt or its prodrug as an active ingredient. 2. The tool according to claim 1, which reduces the frequency of transient relaxation of the lower esophageal sphincter. 3. An agent for suppressing gastric acid reflux and / or stomach contents containing 4 - [({6- [isobutyl (1,3-thiazol-2-ylsulfonyl) amino] -2,3-dihydro-1H-inden-5-yl} hydroxy) methyl] -3-methylbenzoic acid, its salt or its prodrug as an active ingredient. 4. Means for preventing or preventing exacerbation of gastroesophageal reflux disease containing 4 - [({6- [isobutyl (1,3-thiazol-2-ylsulfonyl) amino] -2,3-dihydro-1H-inden-5-yl} oxy) methyl] -3-methylbenzoic acid, its salt or its prodrug as an active ingredient. 5. An agent for treating and / or improving a gastroesophageal reflux disease condition containing 4 - [({6- [isobutyl (1,3-thiazol-2-ylsulfonyl) amino] -2,3-dihydro-1H-inden-5-yl} hydroxy) methyl] -3-methylbenzoic acid, its salt or its prodrug as an active ingredient. 6. The agent of claim 5, wherein the gastroesophageal reflux disease is non-erosive. The agent of claim 5, wherein the symptoms of gastroesophageal reflux disease are heartburn and / or acid reflux. The tool according to any one of paragraphs. 5-7, where gastroesophageal reflux disease is resistant to a proton pump inhibitor. 9. The tool according to claim 5-7, which is used in combination with a drug selected from proton pump inhibitors, histamine H2 receptor antagonists, gastrointestinal prokinetics,1. Средство подавления транзиторного расслабления нижнего пищеводного сфинктера, содержащее 4-[({6-[изобутил(1,3-тиазол-2-илсульфонил)амино]-2,3-дигидро-1H-инден-5-ил}окси)метил]-3-метилбензойную кислоту, ее соль или ее пролекарство в качестве активного ингредиента.2. Средство по п. 1, которое уменьшает частоту транзиторно
