chapter  24
Ethnopharmacology of Tylophora asthmatica Wight & Arn.
Pages 6

T, asthmatica contains 0.2-0.3% of alkaloids having phenanthroindalizidine and furoquinoline framework. Tylophorine (Fig. 5.15) and tylophornine are important alkaloids encountered and the percentage is not affected by seasonal variations.