Rotenoids are naturally occurring substances containing a cis-fused tetrahydrochromeno[3,4-b]chromene nucleus. Rotenoids are related to the isoflavones. == Natural occurrences == Many plants in the subfamily Faboideae contain rotenoids. Rotenoids can be found in Lonchocarpus sp. Deguelin and tephrosin can be found in Tephrosia vogelii. 6`-O-β-D-....