Alkaloids such as caffeine, cinchonine, quinine or strychnine, precipitates polyphenols and tannins. Caffeine, as do other alkaloids such as cinchonine, quinine or strychnine, precipitates polyphenols and tannins. It is a stereoisomer and pseudo-enantiomer of cinchonine. Other alkaloids that are extracted from this tree include cinchonine, cinchonidine and quinidine. Cinchonine is an alkaloid found in "Cinchona officinalis".