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Synthesis and antimicrobial activities of 2-substituted 12 H -chromeno[3,2- e ][1,2,4]triazolo[1,5- c ]pyrimidines,3-ethoxycarbonyl-12 H -chromeno[3,2- e ][1,2,4]triazolo[1,5- c ] pyrimidine-2-one and ethyl 2-formylamino- and 2-acetylamino-4 H -chromene-3-carboxylates