4-Pyrimidones compositions, and methods of use
 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-methoxybenzyl)-4-p yrimidone and 2-[2-(5-methyl-4-imidazolylmethylthio)ethylamino]-6-benzyloxy-4-pyrimidone . 
SmithKline & French Laboratories Limited
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inventional inventional inventional
Thomas H. Graham J. John C. Charon R.
Brown Durant Emmett Ganellin