- Benzopyran derivatives and pharmaceutical compositions containing them
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New benzopyran derivatives of formula: STR1 in which R1 is hydrogen, halogen, hydroxy, alkoxy, nitro, amino, alkylsulphonamido, bis(alkylsulphonyl) amino or acylamino, X is nitrogen or a >CH-radical R is a radical of formula: STR2 in which A de
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