Pyrocatechol monoglucoside (Pyrocatecholmonoglucosid) is a phenolic glycoside isolated from Dioscorea nipponica Mak. and is used in the synthesis of azo dyes.
Longistylin A and longistylin C show some cytotoxic effects, with IC(50) values of 0.7-14.7 microM against the range of cancer cell lines. Longistylin A and longistylin C, and betulinic acid show a moderately high in vitro activity against the chloroquine