To search for substances, you can enter the following query terms; "CAS Registry Number®"(CAS No.), "Substance Name" and/or "Molecular Formula". When you enter more than one query term, only substances that are relevant to all your search terms will be retrieved. You can select categories by checking categories you want to search from <Search by category>. In addition, you can set more complexed search conditions from "Search Options" by clicking and switching to the "Search Options" tab.

Enter a CAS Registry Number in the "Search by Number" field.
In the case of the "Search Options", you can use a wild card either "*" or "?".
"*": Matches any number of characters.
"?": Matches any single character in a specified location.

Enter a substance name in the "Search by Name" field. You can enter multiple keywords which need to be separated with space. If you select "Exact Match" in the list box, only substances that include all of your search terms will be retrieved. Alternatively, selecting "partial match" allows you to search all substances that include either of your search terms.
When you enter keywords in some fields, or when you search by both <Keyword> and <Search by category>, only substances which meet all conditions will be searched.
In the case of the "Search Options", you can use a wild card either "*" or "?".
"*": Matches any number of characters.
"?": Matches any single character in the specified location.

Please enter a molecular formula with alphanumeric symbols in the "Search by Molecular Formula" field by Hill method. In this method, substance containing carbon is described in the following order: the first is "C", and the next is "H", and other elements follow them in alphabetical order. Substance not containing carbon is described in alphabetical order with no exception.

You can change the display format of Interim Search Results as indicated below.

You can change the display format of "Search Results". The default setting is "Excluding blank data". To add empty items, check "Including blank data".

You can search substances by structure from "Search Options" page.

You can select categories by checking the categories you want to search.
When you click on two or more categories, all substances relevant to categories you checked will be retrieved. The categories and information sources are as follows:

If more than one substance is found, "Interim Search Results (AJCSD_ID based)" will be displayed.

If you click "Downloading the search results" link, the list of search results in TSV format (tab separated values format) will be downloaded.

If you click on a triangular mark next to an item name, the list of search results sorted in the designated order will be displayed again.

If you click digits on the "No." field, "Search Results" page will be displayed.

"Interim Search Results (AJCSD_ID based)" page has the same function as "Enter Search Conditions" page on the bottom.

A substance list in each category will be displayed by clicking each listed name.

The description of each list will be displayed.

Last updated date of each list can be shown in "Data Description" page.

The list can be switched from "List Stage One (Decree number etc. based)" to "List Stage Two (AJCSD_ID based)", and vice versa.

If you click on the " " link button of each substance, you can see the "List Stage Two (AJCSD_ID based)"page (if the substance includes two or more corresponding substances) or "Search Results" page will be displayed.

If you click a triangular mark next to an item name, a list will be sorted and displayed again in order of the item you have selected.

If a list is divided into multiple pages, you can change the page from "<<Previous Page" link, "Next Page>>" link or the pull-down menu.

If you download each list in TSV format (tab separated values format), click on the "Download the search results" link.