Screening for five alkaloids as reversal agents against gastric cancer multiple drug resistance and study on their mechanism Screening for five alkaloids as reversal agents against gastric cancer multiple drug resistance and study on their mechanism The Isolation and Structural Determination of r-harmine from the Seed of Peganum harmala L. Investigation on representation methods of dissolubility property of total alkaloid extract from Peganum harmala Preparation of harmine hydrochloride liposome by active loading method