Search for a Chemical Name?
TOPIC: Some chemical substances have a large number of synonyms for their names. It is important to capture all name variations to perform an in-depth literature search. Using a CAS® Registry Number offers the ideal solution. The CAS Registry Number retrieves all references to a chemical, regardless of the names/synonyms used in the record.
The American Chemical Society has assigned a unique number called a CASRegistry Number to every unique chemical. Each number designates only one substance and represents the chemical regardless of which synonym is used. The CAS Registry Number has no chemical significance, but it provides a link to a wealth of information about a specific chemical substance. CAS Registry Numbers are searchable in many Dialog files using the RN=prefix.
Files available on Dialog to identify a chemical name that has Registry Numbers include Chapman and Hall Chemical Database (File 303), The Merck Index OnlineSM (File 304) and Registry of Toxic Effects of Chemical Substances (File 336).
For this example, we want to search for records on Vitamin A. Since Vitamin A has a number of synonyms, including Afaxin, Prepalin, Beta-Retinol, Testavol, and Vitpex, we want to find the CAS Registry Number for Vitamin A, so we can retrieve all literature for the chemical. We will use the Dialog OneSearch® category RNLOOKUP, CAS® Registry Number Lookup.
SELECT NA=VITAMIN A
DS S1 FROM EACH
TYPE S1/9/1 FROM 304
1. BEGIN the OneSearch category RNLOOKUP in which all databases have CAS Registry Numbers.
SYSTEM:OS - DIALOG OneSearch
File 304:The Merck Index Online 2012S1
A subsid. of Merck&Co,Inc.,USA
File 336:RTECS 2012/Q3
Portions (c) Copyright 2012, U.S. Government.
Set Items Description
--- ----- -----------
|2. SELECT the chemical name using the prefix (NA=). You can also EXPAND the chemical name if you are unsure of its spelling.
? e na=vitamin a
Ref Items Index-term
E1 1 NA=VITALOID
E2 1 NA=VITAMEDIN
E3 2 *NA=VITAMIN A
E4 2 NA=VITAMIN A ACETATE
E5 2 NA=VITAMIN A ACID
E6 1 NA=VITAMIN A ACID METHYL ESTER
E7 1 NA=VITAMIN A ACID SODIUM SALT
E8 1 NA=VITAMIN A ACID, ALL-TRANS-
E9 2 NA=VITAMIN A ALCOHOL
E10 1 NA=VITAMIN A ALCOHOL ACETATE
E11 2 NA=VITAMIN A ALDEHYDE
E12 1 NA=VITAMIN A AMIDE
. . . .
Enter P or PAGE for more
S1 2 NA='VITAMIN A'
|3. DISPLAY SETS from the created set adding the FROM EACH qualifier to see the number of records from each database in RNLOOKUP.
? ds s1 from each
Set File Items Description
S1 2 NA='VITAMIN A'
4. TYPE the record from File 304 using the FROM qualifier.
Note the large number of synonyms and brand names.
Note: A portion of the record has been omitted from this display.
? t s1/9/1 from 304
1/9/1 (Item 1 from file: 304)
DIALOG(R)File 304: The Merck Index Online
A subsid. of Merck&Co,Inc.,USA. All rights reserved.
10013 Monograph Name: Vitamin A
CAS REGISTRY NUMBER: 68-26-8
MOLECULAR FORMULA: C20H30O MOLECULAR WEIGHT: 286.45
MOLECULAR COMPOSITION: C 83.86%, H 10.56%, O 5.59%
C.A. CHEMICAL NAME(s): Retinol
all-trans-retinol (all-E)-3,7-dimethyl-9-(2,6,6-trimethyl-1-cyclohexen-1 -yl)-2,4,6,8-nonatetraen-1-ol ; anti-infective vitamin ; antixerophthalmic vitamin ; axerophthol ; lard-factor ; oleovitamin A ; ophthalamin (obsolete) ; vitamin A1 ; vitamin A alcohol
BRAND NAME (and COMPANY):
Aquasol A (AAI); Avibon (Aventis); Avitol (Lannacher); Vogan (Merck KGaA)
Fat soluble, essential micronutrient. Occurs preformed only in animals; metabolized from carotenoids, such as beta-carotene, q.v., in the intestinal mucosa. Dietary sources include liver, milk, butter, cheese, eggs and fish liver oils or as carotenoids from fruits and vegetables. Stored primarily in the liver in esterified form; transported in the blood....
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