Armatans A and B, New Antimicrobial Isoflavans from Colutea armata.

Armatans A (1) and B (2), new isoflavans, have been isolated from the EtOAc-soluble fraction of the MeOH extract of Colutea armata Hemsl. & Lace, along with sativan (3), 6-hydroxyisosativan (4), ferulic acid (5), and caffeic acid (6), isolated for the first time from this species. Their structures were elucidated by spectroscopic techniques including MS and 2D NMR spectroscopy. The new compounds 1 and 2 showed significant antimicrobial activity. [ABSTRACT FROM AUTHOR]