A new biisoflavonoid, biseryvarin A (1a), together with two known compounds were isolated from the roots of Erythrina variegata. The structure of biseryvarin A was established on the basis of spectroscopic evidence. Biseryvarin A is the first dimeric isoflavonoid possessing isoprenoid groups from the genus Erythrina. Biseryvarin A showed low activity against methicillin-resistant Staphylococcus aureus (MRSA).
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TanakaH, EtohH, WatanabeN, ShimizuH, AhmadM, RizwaniGH. (2001) Erysubins C-F, four isoflavonoids from Erythrina suberosa var. glabrescens. Phytochemistry, 56769-773.
