Pronunciation: [sˈɪdɒnə͡l] (IPA)
Correct spelling for the English word "sidonal" is [sˈɪdɒnə͡l], [sˈɪdɒnəl], [s_ˈɪ_d_ɒ_n_əl] (IPA phonetic alphabet).
Piperazin quinate.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.