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Chemical structures of lipid A (the toxic component of endotoxin), MPLAsm, and MPLAsyn. (a) Lipid A structure. (b) A representative structure of MPLAsm (hexa-acylated MPL). Other MPLAsm structures are shown in Supplementary Figure 1a. (c) Synthetic MPLA (GLA and PHAD-504) structures. PHAD-504 contains a lauroyl group (C12) at the secondary acyl chain (blue colored fatty acid) of the 2’-position instead of a myristoyl group (C14) compared with the GLA (PHAD) structure.
