Lloydia. 1978 Sep-Oct; 41(5): 432-4.

Antitumor Plants. V. Constituents of Cinchona pubescens.

Raffauf RF, Le Quesne PW, Ghosh PC.

The stem bark and stem wood of Cinchona pubescens were found to owe their weak cytotoxic activity to the presence of quinovic acid. This acid and its 3-rhamnoside were isolated and characterized through several derivatives, all of which were assayed for their cytotoxicity.