Cicer flavonoids

It has already been noted that there is a considerable structural variation among isoflavonoids and at least three other structural types are represented in the genus Cicer. Note that the numbering systems for these variants differ from each other. Isoflav-3-enes conform to the usual flavonoids numbering system but coumestanes and arylbenzofurans are different. 

The flavonols are the largest subclass of the flavonoids yet constitute a relatively small amount of natural products literature for Cicer. Nonetheless, several are known to occur. They have the typical 2-phenylchroman skeleton and occur with considerable variety of structures owing to the variety of glycosides. 

Wong et al. [23] but careful reading indicates that although Wong et al. did identify 67 this later study was the first report of 80 in Cicer [81]. They also reported the occurrence of 3-O-glucosides of these flavonoids as a general observation so from their work it is not possible to determine whether this would have included fisetin-3-O-glucoside [81]. 

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