Biorobin, a flavonoid from the Euphorbiaceae plant tropical iron amaranth, significantly inhibits human lymphocyte proliferation in vitro.

Chaetocin, a natural product from Chaetomium species, is a histone methyltransferase inhibitor with IC50 of 0.8 μM, 2.5 μM and 3 μM for dSU(VAR)3-9, mouse G9a and Neurospora crassa DIM5, respectively.

Kaempferol 3,4'-diglucoside, a flavonol compound, has been isolated from the aqueous methanolic extract of Norway spruce buds. Furthermore, this compound has also been identified in the needles of the Norway spruce.