4-[[(2-aminoethyl)thio]methyl]-5-methylimidazole

2-[[(4-Methyl-1H-imidazol-5-yl)methyl]thio]ethanamine is an intermediate in the synthesis of N-?Cyano-?N''-?[2-?[[(5-?methyl-?1H-?imidazol-?4-?yl)?methyl]?thio]?ethyl]?-carbamimidic Acid Methyl Ester (C988063), an impurity of Cimetidine (C441650). Cimetidine acts as a competitive histamine H2-receptor antagonist which inhibits gastric acid secretion and reduces pepsin output (1).