Correct spelling for the English word "Nucin" is [njˈuːsɪn], [njˈuːsɪn], [n_j_ˈuː_s_ɪ_n] (IPA phonetic alphabet).
Juglandic acid, C36H12O10, derived from butternut-bark, or juglans.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.