Synthesis and antiallergic properties of some 4H,5H-pyrano[3,2-c][1]benzopyran-4-one, 4H,5H-[1]benzothiopyrano[4,3-b]pyran-4-one, and 1,4-dihydro-5h-[1]benzothiopyrano[4,3-b]pyridin-4-one derivatives.

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