This is the only case in the mixed acid fermentation pathway where ATP is not produced via substrate-level phosphorylation.
ðɪs ɪz ðɪ ˈoʊnli kˈeɪs ɪnðə mˈɪkst ˈæsɪd fɜːməntˈeɪʃən pˈæθweɪ wˌɛɹ ˌeɪtˌiːpˈiː ɪz nˌɑːt pɹədˈuːst vˈaɪə sˈʌbstɹeɪtlˈɛvəl fˌɑːsfoːɹɪlˈeɪʃən.