Task: Translation
Input (Czech): Tetrahydropyridoethery obecn ho vzorce I, v n m  R1 znamen  methyl nebo hydroxymethyl, jeden ze substituent  R2a a R2b znamen  atom vod ku a druh² znamen  hydroxyskupinu, methoxy-, ethoxy-, isopropoxy-, methoxyethoxy- nebo methoxypropoxyskupinu, jeden ze substituent  R3a a R3b znamen  atom vod ku a druh² znamen  hydroxyskupinu, methoxy-, ethoxy-, isopropoxy-, methoxyethoxy- nebo methoxypropoxyskupinu, za p°edpokladu,  e na jedn  stran  R2a nebo R2b a na druh  stran  R3a a R3b neznamenaj  sou asn  hydroxyskupiny, jako  i soli t chto slou enin, jsou l tky s ochrann²m · inkem na  alude n  a st°evn  sliznici a s inhibi n m · inkem na sekreci  alude n  kyseliny. Jejich pou it  pro l  en  a prevenci gastrointestin ln ch chorob, zejm na z n tliv²ch chorob a v°edov²ch chorob.\
Output (English): The present invention relates to tetrahydropyridoethers of the general formula I, in which R1 represents methyl or hydroxymethyl, one of the R2a and R2b substituents represents a hydrogen atom and the other represents a hydroxy group, a methoxy, ethoxy, isopropoxy, methoxyethoxy or methoxypropoxy group, one of the R3a and R3b substituents represents a hydrogen atom and the other represents a hydroxy group, a methoxy, ethoxy, isopropoxy, methoxyethoxy or methoxypropoxy group with the proviso that R2a or R2b on one side and R3a and R3b on the other side do not represent simultaneously hydroxy groups, as well as salts of these compounds. The above-described compounds exhibit protective effect to stomach and intestinal mucous membranes and further exhibit inhibition activity on stomach acid secretion. Claimed is also their use for treating and prevention of gastrointestinal diseases, in particular inflammatory and ulcerous diseases.