CICNs Main Chemical Classes Sub-groups
10000-10299 Nitroso  
10300-10999 Nitro  
11000-19999 Monoazo  
20000-20999 Disazo Synthetic type I
21000-25999 Disazo Synthetic type II
26000-28999 Disazo Synthetic type III
29000-29999 Disazo Synthetic type IV
30000-31499 Trisazo Synthetic type I
31500-33499 Trisazo Synthetic type II
33500-33999 Trisazo Synthetic type III
34000-34899 Trisazo Synthetic type IV
34900-34999 Trisazo Synthetic type V
35000-35999 Tetrakisazo  
36000-36999 Polyazo  
37000-39999 Azoic  
40000-40599 Stilbene 5 types
40600-40799 Stilbene Fluorescent brighteners
40800-40999 Carotenoid  
41000-41999 Diphenylmethane  
42000-42499 Triarylmethane Diamino
42500-43499 Triarylmethane Triamino
43500-43799 Triarylmethane Aminohydroxy
43800-43999 Triarylmethane Hydroxy
44000-44499 Triarylmethane Naphthyl
44500-44999 Triarylmethane Miscellaneous
45000-45299 Xanthene Fluorenes (5 types)
45300-45349 Xanthene Rhodols
45350-45549 Xanthene Fluorones (2 types)
45550-45999 Xanthene Miscellaneous
46000-46999 Acridine  
47000-47999 Quinoline  
48000-48999 Methine and Polymethine  
49000-49399 Thiazole  
49400-49699 Indamine  
49700-49999 Indophenol  
50000-50029 Azine Quinoxalines
50030-50049 Azine Eurhodines
50050-50199 Azine Aposafranines (4 types)
50200-50399 Azine Safranines (3 types)
50400-50499 Azine Indulines and Nigrosines
50500-50999 Azaheterocyclic Pyrazolines and fused ring systems
51000-51299 Oxazine Oxazines
51300-51399 Oxazine Dioxazines
51400-51499 Oxazine Oxazones
51500-51999 Benzoxazole  
52000-52999 Thiazine  
53000-54999 Sulfur 7 sections
55000-55999 Lactone  
56000-56099 Aminoketone and Hydroxyketone Arylaminoquinones
56100-56149 Aminoketone and Hydroxyketone Diketopyrrolopyrroles
56150-56189 Aminoketone and Hydroxyketone Isoindolines and Acridones
56190-56999 Aminoketone and Hydroxyketone Naphthalimides
57000-57999 Aminoketone and Hydroxyketone Hydroxyketones
58000-58899 Anthraquinone Hydroxy
58900-60499 Anthraquinone Polycyclic analogues
60500-60999 Anthraquinone Amino and Aminohydroxy
61000-64999 Anthraquinone Polyamino
65000-66699 Anthraquinone Dianthrimides and Amides
66700-72999 Anthraquinone Heterocyclic analogues
73000-73299 Indigoid Indigo and homologues
73300-73594 Indigoid Thioindigo and homologues
73595-73799 Indigoid Hybrids
73800-73899 Indigoid Miscellaneous
73900-73999 Quinacridone  
74000-74999 Phthalocyanine  
75000-75999 Natural  
76000-76999 Oxidation Bases  
77000-77999 Inorganic