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Transtorine is a quinoline alkaloid, found from Ephedra transitoria, with antibacterial activity[1].

ChEBI: Kynurenic acid is a quinolinemonocarboxylic acid that is quinoline-2-carboxylic acid substituted by a hydroxy group at C-4. It has a role as a G-protein-coupled receptor agonist, a NMDA receptor antagonist, a nicotinic antagonist, a neuroprotective agent, a human metabolite and a Saccharomyces cerevisiae metabolite. It is a monohydroxyquinoline and a quinolinemonocarboxylic acid. It is a conjugate acid of a kynurenate.

[1] al-Khalil S, et al. Transtorine, a new quinoline alkaloid from Ephedra transitoria. J Nat Prod. 1998 Feb;61(2):262-3. DOI:10.1021/np9702998