has primary output steroid biosynthetic process biosynthetic process ketone biosynthetic process hormone biosynthetic process ecdysteroid metabolic process ecdysteroid biosynthetic process The chemical reactions and pathways resulting in the formation of ecdysteroids, a group of polyhydroxylated ketosteroids which initiate post-embryonic development. GO:0045456 ecdysteroid formation ecdysteroid anabolism ecdysteroid synthesis ecdysteroid biosynthesis biological_process