English: Chemical structure of the saponin natural product QS-21 (also termed QS21), consisting of a quillaic acid triterpene (black) substituted with a branched trisaccharide (blue) and a linear tetrasaccharide (green), which is in turn connected to an acyl chain (red) via a hydrolytically labile ester (marked with an asterisk). QS-21 is a 65:35 mixture of the Apiose- and the Xylose-substituted variants of above molecule.
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Own work, based on Ragupathi, G; Gardner, JR; Livingston, PO; Gin, DY (2014). "Natural and synthetic saponin adjuvant QS-21 for vaccines against cancer". Expert Review of Vaccines10 (4): 463. DOI:10.1586/erv.11.18. PMID21506644.
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