has role has parent hydride ecdysone A 6-oxo steroid that is 5β-cholest-7-en-6-one substituted by hydroxy groups at positions 2, 3, 14, 22 and 25 respectively (the 2β, 3β, 22<i>R</i> stereoisomer). It is a steroid prohormone of the major insect moulting hormone 20-hydroxyecdysone. CHEBI:16688 ecdysteroid 3beta-sterol 5beta-cholestane 2beta-hydroxy steroid 14alpha-hydroxy steroid 22-hydroxy steroid 25-hydroxy steroid 6-oxo steroid prohormone