antiparasitic chemical compound alcaloid 2012-02-23T10:31:23Z Any of basic nitrogen compounds (mostly heterocyclic) occurring mostly in the plant kingdom (but not excluding those of animal origin). Amino acids, peptides, proteins, nucleotides, nucleic acids, amino sugars and antibiotics are not normally regarded as alkaloids. By extension, certain neutral compounds biogenetically related to basic alkaloids are included. IDOMAL:6000016 IDOMAL:6000016 idomal_namespace louis