Limit Fields

The limit fields listed below are specially indexed fields that either have relatively few possible values or which are useful to browse (e.g. in WinSPIRS). They allow you to limit your searches to records of a particular type.

CAS Registry Number (RN)

EC Number (EC)

Molecular Weight (Integers) (MW)

RTECS Number (RTEC)

Update Code (UD)

You can search these fields with in or =. For example, to retrieve documents with a molecular weight of 92 or more but less than 93, type:

92 in mw or mw=92

In addition to in and =, the following operators may be used with the MW and UD fields:

You can search these fields with the following operators, as well as with in and =:

< Less than,

such as mw<100

> Greater than,

such as ud>199712

<= Less than or equal to,

such as mw<=20

>= Greater than or equal to,

such as mw>=300

 - Within a range,

such as ud=199601-199802