Androstane is a C19 steroid with a gonane core.
A double bond in chemistry is a chemical bond between two chemical elements involving four bonding electrons instead of the usual two.
Estradiol (E2), also spelled oestradiol, is an estrogen steroid hormone and the major female sex hormone.
Estrin (American English), or oestrin (British English), also known as estra-1,3,5(10)-triene, is an estrane steroid.
Estriol (E3), also spelled oestriol, is a steroid, a weak estrogen, and a minor female sex hormone.
Estrogen, or oestrogen, is the primary female sex hormone.
Estrone (E1), also spelled oestrone, is a steroid, a weak estrogen, and a minor female sex hormone.
Gonane (C17), also known as perhydrocyclopentaphenanthrene, is a tetracyclic hydrocarbon ring structure and the fundamental steroid nucleus.
Nandrolone, also known as 19-nortestosterone, is an androgen and anabolic steroid (AAS) which is used in the form of esters such as nandrolone decanoate (brand name Deca-Durabolin) and nandrolone phenylpropionate (brand name Durabolin).
Pregnane is a C21 steroid and, indirectly, a parent of progesterone.
A steroid is a biologically active organic compound with four rings arranged in a specific molecular configuration.
A steroid hormone is a steroid that acts as a hormone.