Preferred Label : tetrapyrroles; 
IUPAC definition : Natural pigments containing four pyrrole rings joined by one-carbon units linking
               position 2 of one pyrrole ring to position 5 of the next. porphyrins are macrocyclic
               tetrapyrroles. E.g. bilin (a linear tetrapyrrole).; 
         
         
            Origin ID : T06291; 
 Automatic exact mappings (from CISMeF team) Automatic exact mappings (from CISMeF team)
 See also See also
 
         
         
         Natural pigments containing four pyrrole rings joined by one-carbon units linking
            position 2 of one pyrrole ring to position 5 of the next. porphyrins are macrocyclic
            tetrapyrroles. E.g. bilin (a linear tetrapyrrole).