Fig. 4.

Structure of thirteen nitrogen containing, non-peptide substances extracted and isolated from the edible Chinese black ants (Polyrhachis dives). a) 5-(3-Indolylmethyl)-nicotinsaureamide; b) β-Carboline-3-carboxamide; c) 4-Pyridin-3-yl-phenol; d) harman; e) β-carboline; f) S-1-(1′-hydroxyethyl)-β-carboline; g) 8-hydroxy-4-quinolone; h) 1,2,3,4-tetrahydroquinoline; i) niacinamide; j) 3-hydroxypyridine; k) 2,5-disubstituted oxazole; l) glutamine methyl ester; and m) cyclo-(L-Pro-L-Phe). Source: [253].