baɪ kˈɑːntɹæst wɪððɪ ˈʌðɚ sɪnθˈɛɾɪks, haʊˈɛvɚ, ɪt hɐz ɐ sˈɪmpəl tʃˈeɪn stɹˈʌktʃɚ wɪððə ɹᵻpˈiːt jˈuːnɪt ʌv fˈɔːɹm mˈaɪnəs sˌiːˈeɪtʃ tˈuː ˈoʊ mˈaɪnəs.
By contrast with the other synthetics, however, it has a simple chain structure with the repeat unit of form −[CH2O]−.