STN International - The Scientific and Technical Information Network
Search Example: Chemical Name Lookup
Question: How can I locate the CAS Registry Number for L-lysine and then find preparation information?
Strategy: Searching for chemical substance information using a chemical name
is a 2-step prozess:
1. Locate the CAS REGISTRY record for the substance by using the CAS Number option.
2. Select the link to substance information of interest ("crossover search").
Use this strategy as well when you want to identify a CAS Number, identify a chemical structure or locate other chemical names.
Search Strategy
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Log on to STN Easy at STN Easy Home Page
If you do not have an existing STN account:
To open a new STN Easy account, click the blue "Open New Account" button on the STN Easy Home Page and complete and submit the online forms. Within 30 minutes, your STN login ID and password will be sent to the e-mail address you specify.
If you have an existing STN account:
To log on to STN Easy, simply enter your login ID and password.
Then click "Start Your Session."
More info about STN Easy Home Page
   CAS Number Search:
STN Easy Search Page
The Search Page is displayed. It offers three different search options: "Easy", "Advanced" and "CAS Number" Search.
To search for a chemical substance like L-lysine, select the "CAS Number" tab.
Enter the name "L-lysine" in the search box and click the green "Search" button.
Note that the search fee is shown below the Search button.
More info about CAS Number Search
Hint: Use the free "Browse Index" button before clicking "Search" to confirm that the chemical name you entered is spelled correctly and is included in the database you have chosen - before you actually pay for the search.
More info about Browse Index feature
   1. Answer Page:
Select title at Answer Page
The Answer Page is displayed: STN Easy locates L-lysine in the CAS REGISTRY database.
Click on the REGISTRY hyperlink to display the detailed record. - You may change the Display Format and Display Style using the selection boxes at the bottom of the title list.
Please note: The display cost is shown to the right of the answer.
More info about STN Easy Answer Page
   1. Display Page:
See detailed record at Display Page
The REGISTRY Display Page appears.
It includes the CAS Registry Number and also provides a wealth of additional information for the substance through hyperlinks to other STN databases.
To access preparation information, use the scrolling list located below the "Chemistry References" link. Select "Preparation" and "Synthetic Preparation" from the list. Hold down the Control key (Command key on Macintosh) to select discontinuous items.
Click on "Chemistry References".
More info about STN Easy Display Page
   2. Answer Page:
Select title at Answer Page
The list of answers is displayed on another Answer Page.
Review the answers and click a title of interest. - Note the display costs to the right of the answer.
Helpful HINT: In order to view records for several answers at once, simply check the boxes next to the appropriate answers and click the blue "Display Answers" button at the bottom of the page.
   2. Display Page:
See detailed record at Display Page
Once more, the Display Page shows the record for the title you selected - right at your desktop.
Furthermore, you are free to choose between various options available at Display Page such as full-text order, citation-searching, searching the web etc.
Notice that for recent answers (1999 forward) from the CAplus database, the first five references are listed at the end of the display. When the cited reference is available in CAplus or Medline, you can click the link to be taken directly to that display for the normal display fee. You avoid the search fees!
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