3(2H)pyridazinone, and anti-allergic agent containing it
A 3(2H)pyridazinone of the formula: STR1 wherein R1 is hydrogen or C1 -C5 alkyl; R2 is hydrogen, C1 -C8 alkyl, chlorine or bromine; A is --NR3 -- or --O--; X is --(CH2
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(2008/06/13)
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