Phytochemical studies with Aristolochia arcuata led to the isolation o
f KNO3, fructose, sucrose, sitosterol, calarene, its 2-oxo derivative,
and three neolignans. Besides which, two new 13-oxidodibenzo[a, g]-qu
inolizinium alkaloids were isolated. They present only one oxygenated
substituent at rings A and D.