Dioxocyclobutene compounds
 1-(Hydroxypropylamino)-2-aminocyclobut-1-ene-3,4-dione compounds are disclosed as useful intermediates in the preparation of histamine H.sub.2 -antagonists. 
Smith Kline & French Laboratories Limited
C C
C07D C07D
inventional inventional
Thomas H. Rodney C.
Brown Young