First isolation of a symmetrical glycosylated methylene bisflavonoid

Blutaparon portulacoides (St. Hil.) Mears ( = Philoxerus portulacoides St. Hil.) (Amaranthaceae) is a species occurring in the Brazilian coast in two botanical varieties. The chemical study of an ethanolic extract led to the isolation of spinacetin 3-O-robinobioside as well as an unique glycosylated pseudodimeric flavonoid identified as 8,8''''-methylene bis(spinacetin 3-O-robinobioside) mainly by NMR analyses (H-1, H-1-H-1 COSY, C-13, HMQC, HMBC) and MALDI-TOF mass spectrometry.