ChEBI: 6-ketoestriol is a 3-hydroxy steroid that is estriol carrying an oxo group at position 6. It has a role as a human urinary metabolite. It is a 3-hydroxy steroid, a 6-oxo steroid, a 16alpha-hydroxy steroid and a 17beta-hydroxy steroid. It is functionally related to an estriol. It derives from a hydride of an estrane.