Kopsanone and N-oxide isolated from Mart. (Apocynaceae) leaves and their MAO-A inhibitory activity.

Mart., popularly known as 'guatambu' or 'peroba', is found from North American (Mexico) to South American (Argentina) continents and in Brazil. Two indole alkaloids were isolated from leaves of , kopsanone () and unreported (4)-oxide-kopsanone ().

Cytotoxicity and anti-inflammatory effects of the extract, fractions and alkaloids from (Rubiaceae).

species has been used in folk medicine in the treatment of some diseases including cancer and inflammatory disorders. This work aimed to evaluate the antiproliferative and topical anti-inflammatory activities of the methanolic extract, fractions and two major alkaloids isolated from . Methanolic extract, non-alkaloidal and alkaloidal fractions exhibited strong growth inhibition for ovarian cell lines (OVCAR-3, GI = 3.