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A new class of pyrano[3,4-c]chromene, benzo[c]chromene, chromeno[3,4-c]pyridine and chromeno[4,3-c]pyrazole has been prepared from 3-benzoyl-2H-chromen-2-one 1.Most of the chromene derivatives showed moderate to high antibacterial activity as compared to the starting material 1.
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El‐Saghier et al. (2007) studied this question.
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