Estrogens
Estrogens are female sex hormones produced by the ovaries, male gonads, adrenal glands, placental, and other steroid-producing tissues. They are characterized by their ability to induce strong sexual attraction in female mammals. Estrogens are responsible for the development of female secondary sexual characteristics and are used in the treatment of menopause or in the manufacture of contraceptives. They include the following estrogens, derivatives, and analogs:
a) estrone (INN). The main estrogen in humans;
b) estradiol (INN). An important natural estrogen;
c) estriol (INN). A natural estrogen;
g) ethinylestradiol (INN). Important synthetic estrogen active when taken orally and used as the main estrogenic component in oral contraceptives;
e) mestranol (INN). Simple ether of ethinylestradiol. Used as an oral contraceptive
Source: "Explanatory Notes to the Commodity Nomenclature of Foreign Economic Activity of the Russian Federation (HS RF)" (prepared by the State Committee on Standards of Russia) (volume 1, sections I - VI, groups 1 - 29)