ðə pɹoʊdʒˈɛstɪnz ˈælaɪlˌɛstɹənˌɑːl θɹˈiːdɛkˈiːɾoʊ sˈɛvəntˌiːn ˈælfəˈælaɪl nˈaɪntiːnˌɛntˈiː ænd lˈaɪnɪstɹˌɛnɑːl θɹˈiːdɛkˈiːɾoʊ sˈɛvəntˌiːn ˈælfəˈɛθɪnˌaɪl nˈaɪntiːnˌɛntˈiː ɑːɹ ˈɔːlsoʊ klˈoʊsli ɹᵻlˈeɪɾᵻd tʊ ˈɛθaɪlstɹˌɛnɑːl, dˈɪfɚɹɪŋ ˈoʊnli baɪ ðə sˈiː sˈɛvəntˌiːn ˈælfə sˌʌbstɪtˈuːʃən.
The progestins allylestrenol (3-deketo-17α-allyl-19-NT) and lynestrenol (3-deketo-17α-ethynyl-19-NT) are also closely related to ethylestrenol, differing only by the C17α substitution.