sentences:  These compounds are mimics of hormones used by arthropods in the molting process known as ecdysis.When insects eat the plants with these chemicals they may prematurely molt, lose weight, or suffer other metabolic damage and die.Chemically, phytoecdysteroids are classed as triterpenoids, the group of compounds that includes triterpene saponins, phytosterols, and phytoecdysteroids.