Ryecyanatines A and B and ryecarbonitrilines A and B, substituted cyanatophenol, cyanatobenzo[1,3]dioxole, and benzo[1,3]dioxolecarbonitriles from rye (Secale cereale L.) root exudates: Novel metabolites with allelopathic activity on Orobanche seed germin

Ryecyanatines A (1) and B and ryecarbonitrilines A (3) and B, were isolated from rye (Secale cereale L.) root exudates. 1 inhibits the radicle growth of O. crenata, O. cumana and O. minor, while 3 specifically stimulates O. cumana seeds germination.