PYRANO-HETEROCYCLES,PROCESS FOR PREPARING THEM AND MEDICAMENTS CONTAINING THESE COMPOUNDS
Pyrano-heterocycles of the formula in which R1 represent hydrogen or an alkyl radical containing up to 4 carbon atoms; R2 represents hydrogen or an alkyl, alkoxy or haloalkyl radical each having up to 3 carbon atoms, or halogen; or R1 and R2 together form an ethylene or propylene group, and R3 and R...
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