Acylation with diangeloyl groups at C21-22 positions in triterpenoid saponins is essential for cytotoxicity towards tumor cells.
Biochem Pharmacol. 2007 Feb 1;73(3):341-50. doi: 10.1016/j.bcp.2006.10.007. Epub 2006 Nov 7.
Biochem Pharmacol. 2007.
PMID: 17092489