| http://www.w3.org/ns/prov#value | - An alkyl-1-cyclopropyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid of the formula ##STR18## in which X1 is hydrogen, a nitro group or a halogen atom, andX2 and X3 each independently is hydrogen, a nitro group, a halogen atom or an alkyl radical with 1 to 3 carbon atoms, with the proviso that at least one of them is an alkyl radical,or a pharmaceutically acceptable salt or hydrate thereof. 2.
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