Beecham Group Plc

Gordon Burrell

Geoffrey Stemp

John M Evans

David G Smith

Charles S Fake

Compounds of the formula (I) or pharmaceutically acceptable salts thereof ##STR1## where R.sub.2 -R.sub.7, Y, a and b are as defined, are useful in the treatment of hypertension and respiratory tract disorders.

Amino pyrimidin-7-yl substituted benzopyrans for treatment of

Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein a, b, J, Y and R.sub.2 -R.sub.8 are as defined herein are potassium channel activators, a process for their preparation and their pharmaceutical use.

Certain 1,2,4-triazole(oxy or amino)benzopyran derivatives having

A compound of formula (I) or a pharmaceutically acceptable salt thereof: ##STR1## wherein a and b together form an --O-- or --CH.sub.2 -- linkage or a bond;

1,2-diamino-cyclobuten-3,4-dione derivatives

Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein a and b together form an --O-- or --CH.sub.2 -- linkage or a bond;

Guanidino-substituted benzopyrans and their use as pharmaceuticals

Compounds of formula (I), or a pharmaceutically acceptable salt, quaternized derivative, N-oxide or solvate thereof:

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Harlow, United Kingdom

Gordon Burrell