Heterocyclic alkyl 4-pyrimidones
 The compounds are substituted isocytosines which are histamine H.sub.2 -antagonists. Two specific compounds of the present invention are 2-[2-(5-methyl-4-imidazolylmethylthio)ethylamino]-5-(3-pyridylmethyl)-4-py rimidone and 2-[2-(3-bromo-2-pyridylmethylthio)-ethylamino]-5-(4-pyridylmethyl)-4-pyrim idone. 
Smith Kline & French Laboratories Limited
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inventional inventional inventional
Graham J. Charon R. Thomas H.
Durant Ganellin Brown