Ipomoea squamosa

Cao S, Guza RC, Wisse JH, Miller JS, Evans R, Kingston DGI (2005) Ipomoeassins A-E, C)4otoxic Macrocyclic Glycoresins from the Leaves of Ipomoea squamosa from the Suriname Rainforest. J Nat Prod 68 487... 

There is also evidence that those calystegine-positive species for which no analysis of the precursors have been carried out nevertheless use them, too Maripa panamensis unambiguously yielded esters of 3P-hydroxytropane (Table 3.6 thus, it may be assumed that this species is also able to synthesize 3P-hydroxytropane itself. Ipomoea involucrata as well as I. squamosa exhibited 3a-acetoxytropane... 

Fig. 8.3 Resin glycosides from the whole plant of Ipomoea tricolor and the leaves of I. squamosa, two neotropical vines The structures of tricolorin C and of ipomoeassin E differ remarkably with regard to (i) the hydroxy fatty acid moieties, (ii) the position of their linkage to the oligosaccharide components, (iii) the number and - in part - the types of monosaccharides involved, and (iv) the other acyl residues. Tricolorin H represents a heterodimer of two trisaccharides, tricoloric acid C (highlighted in grey) and an acylated (mba) derivative of the monomeric macrolactone tricolorin G (right), linked to each other by esterification of the jalapinolic add moiety of tricoloric acid C at position C-3" (glu) of the macrolactone part...

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