nˈaɪŋkɹˈaʊn θɹˈiː, ˈɔːlsoʊ kˈɔːld wˈʌn,fˈoːɹ,sˈɛvəntɹˈaɪəksˌɑːneɪn ɔːɹ wˈʌn,fˈoːɹ,sˈɛvəntɹˈaɪəksˌæsaɪklˌɑːnənˌeɪn ɪz ɐ kɹˈaʊn ˈiːθɚ wɪððə fˈɔːɹmjʊlə sˈiː tˈuː ˈeɪtʃ fˈoːɹ ˈoʊ θɹˈiː.
9-Crown-3, also called 1,4,7-trioxonane or 1,4,7-trioxacyclononane is a crown ether with the formula (C2H4O)3.