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Screenshot of the CAS Common Chemistry database with information about caffeine ().. A CAS Registry Number [1] (also referred to as CAS RN [2] or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.
Chemical formula Synonyms CAS number C 10 H 16 N 2 O 8: Ethylenediaminetetraacetic acid (EDTA) 6381–92–6 C 12 H 22 O 11: sucrose: 57–50–1 C 18 H 29 O 3 S: sodium dodecyl benzenesulfonate: 2155–30–0 C 20 H 25 N 30: Lysergic acid diethylamide (LSD) 50–37–3 C 123 H 193 N 35 O 37: Common serum albumin (macromolecule) 9048–49–1 ...
The number of atoms of a nucleotide is shown in the right subscript position (e.g., 14 N 2) The proton number (atomic number) may be indicated in the left subscript position (e.g., 64 Gd) If necessary, a state of ionization or an excited state may be indicated in the right superscript position (e.g., state of ionization Na + )
Chemical formula Synonyms CAS number C 20 F 42: perfluoroicosane: 37589-57-4 C 20 H 6 I 4 Na 2 O 5: erythrosine: 16423-68-0 C 20 H 12: perylene: 198-55-0 C 20 H 12: benz(e)acephenanthrylene: 205-99-2 [1] C 20 H 12 O 5: fluorescein: 2321-07-5 C 20 H 13 N 3 O 7: anthracene picric acid: 5937-78-0 C 20 H 14 NO 4: sanguinarine: 2447-54-3 C 20 H 14 O ...
Chemical formula Synonyms CAS number; C 10 Cl 10: dienochlor: 2227-17-0 C 10 Cl 10 O: kepone: 143-50-0 C 10 F 8: perfluoronaphthalene: 313-72-4 C 10 F 14 O: perfluoroadamantanone: 141635-73-6 C 10 F 18: perfluorodecalin: 306-94-5 C 10 F 21 I: perfluorodecyl iodide: 423-62-1 C 10 H 4 Cl 8 O: oxychlordane: 26880-48-8 C 10 H 5 Cl 7: heptachlor: 76 ...
Chemical formula Synonyms CAS number; C 5 BrMnO 5: manganese pentacarbonyl bromide: 14516-54-2 C 5 BrO 5 Re: rhenium pentacarbonyl bromide: 14220-21-4 C 5 Cl 2 F 6 O 2: hexafluoroglutaryl chloride: 678-77-3 C 5 F 6 O 3: hexafluoroglutaric acid anhydride: 376-68-1 C 5 F 8 O 2: hexafluoroglutaryl fluoride: 678-78-4 C 5 F 10 ...
Atom connections (prefix: "c"). The atoms in the chemical formula (except for hydrogens) are numbered in sequence; this sublayer describes which atoms are connected by bonds to which other ones. The type of those bonds is later specified in the stereochemical layer prefixed by "b". Hydrogen atoms (prefix: "h"). Describes how many hydrogen atoms ...
CAS registry numbers are unique numerical identifiers for chemical elements, compounds, polymers, biological sequences, mixtures and alloys. They are also referred to as CAS numbers , CAS RNs or CAS #s .