Alcohol dissolves the active principle, perhaps a glucoside, the study of which the author has not completed.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
Heckel and Schlagdenhauffen have confirmed the febrifuge virtues of the seeds and are uncertain as to the active principle since they found no glucoside or alkaloid in their analysis.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
Contains the glucoside digitalin and other active principles.
"Aids to Forensic Medicine and Toxicology"
W. G. Aitchison Robertson