Correct spelling for the English word "aristochin" is [ˈaɹɪstˌɒt͡ʃɪn], [ˈaɹɪstˌɒtʃɪn], [ˈa_ɹ_ɪ_s_t_ˌɒ_tʃ_ɪ_n] (IPA phonetic alphabet).
Diquinine carbonic-acid ester; a white tasteless powder, containing 96 per cent. of quinine; employed in malaria in adult doses of gr. 8-15 (0.5-1.0).
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.