SEARCH Articles Figures Tables Alkaloid structures unknown structure Alkaloids Unclassified and of Unknown Structure by R. H. F. Manske Alkaloids of Unknown Structure Alkaloids of Unknown Structure by R. H. F. Manske Determining Unknown Structures Mass spectra, unknown, molecular structure elucidation NOESY unknown structure Pigments with Hitherto Unknown Chemical Structure Protein structure unknown Strategies for Elucidating Unknown Molecular Structures Structural elucidation of unknowns Two Aporphines of Unknown Structures from Corydalis gortschakovii Unknown Unknown Three-Dimensional Structures Unknown compounds structural elucidation Unknown or Doubtful Structures