Extraction of the aerial parts of Ophiorrhiza rosacea Ridley (Rubiaceae) ha
s yielded harman-2-oxide (1). Extraction of the aerial parts of O. kunstler
i King yielded the alkaloids palicoside (3) and 3,14-didehydro-19-methylnor
malindine (8). The structures of these compounds followed from their spectr
oscopic properties.