Structures of 9-O-demethylhomolycorine and 5α-hydroxyhomolycorine. Alkaloids of Crinum defixum, C. scabrum, and C. latifolium. Assignment of aromatic substitution patterns from 1H-coupled 13C spectra - Jeffs, P W; Abou-Donia, A; Campau, D; Staiger, D (J Org Chem, 1985)