1 - cyan - 2 - methyl - 3 - amp; 2 - (5 '- methyl imidazole - 4' '- yl) methyl - thiometon} - essential amp; - guanidine z z, cimetidine, method of producing the same and 1 - cyan - 2 methyl - 3 - amp; 2 - (5' - methyl imidazole - 4 '' - yl) methyl - thiometon} - essential amp; - guanidine (a a cimetidine

摘要

The invention relates to a new crystal modification of N-methyl-N'-{2-[(5-methylimidazol-4-yl)-methylthio]-ethyl}-N''-cyanogu anidine (cimetidine), a histamine H-2 receptor antagonist having the Formula (I) IMAGE (I) as well as to a process for preparing same. In the description, this new modification is named N-methyl-N'-{2-[(5-methylimidazol-4-yl)-methylthio]-ethyl}-N''-cyanogu anidine Z (cimetidine Z).