Fisons Ltd.

Astra Pharmaceuticals Limited

David Cox

Anthony Howard Ingall

John L Suschitzky

Hugh Cairns

David E Hall

Paul Andrew Willis

Hossein A Dowlatshahi

Nigel Chadwick

Inhibitors of platelet aggregation

Compounds of formula I, ##STR1## in which A is a 5 or 6 membered, fully unsaturated, carbocyclic or heterocyclic ring,

2-Pyridinyl-phenyl-sulphinyl-and-phenyl-thio-benzimidazoles having

There are described compounds of formula I, ##STR1## in which A is a benzene or heterocyclic ring, y is 0 or 1,

Certain 2-pyridinyl-phenylsulfinyl-benzoxazoles, the corresponding

There are described compounds of formula I ##STR1## in which an adjacent pair of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 form a chain --COCH.dbd.CE--O--, and the remainder of R.sub.5, R.sub.6, R.sub.7 and R.sub.8, which may be the same or different, each represent hydrogen, hydroxy, alkyl, halogen, alkenyl, alkoxy, or --NR.sub.1 R.sub.2 in which R.sub.1 and R.sub.2, which are the same or different, are each hydrogen or alkyl,

7,6 Dioxo-4H,6H-pyrano[3,2-g]quinoline dicarboxylic acids and

There are described compounds of formula I, ##STR1## in which an adjacent pair of R.sub.5, R.sub.6, R.sub.7 and R.sub.8 form a chain --CZC(G.sub.1).dbd.(G.sub.2)--Z--,

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Loughborough, United Kingdom

David Cox