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1-cyclopropyl-6,7-dihalo-1,4-dihydro-4-oxo-1,8-naphthyridine -3-carboxylic acid and their esters, useful as intermediates for preparing the 7-amine substituted naphthyridines

US Patent 4663457 · Granted May 5, 1987

Estimated economic value: $3,302,000

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