A class of naturally occurring nitrogen-containing compounds, many with basic properties; quinine is one example.
One of the related alkaloids obtained from cinchona bark. Different solubilities allow partial separation during crystallization and extraction.
A cinchona alkaloid less soluble in diethyl ether than quinine; this difference underlies a historical purity screen.
An alkaloid isolated from cinchona bark, historically called quinia. The free base and quinine sulfate have different solubilities.
Historical pharmaceutical preparation; its composition and clinical use must be identified by edition. [ref]
An emerald-green colour reaction obtained by treating a suitable quinine solution with chlorine or bromine followed by Ammonia. The 1867 British test specifies chlorine.
The sulfate salt of quinine. Historical and present monographs specify different hydration states, so their formulas and drying tests must be compared by edition.

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