Volume 2 Chapter 11 Text Menu *AUTHOR

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*CCOMMENT

Function

*CCOMMENT is used to test for a chemical connectivity comment.

CSD Contents

Since textual comments in the CSD are composed in "free-language" it is not recommended that such searches are conducted. Rather, when a hit is encountered the textual comment can be displayed to provide details of any comment introduced by CCDC staff.

This field is used mainly to record comments in the following situations:

(a)
If the chemical connectivity (diagram) is exceedingly complex then no chemical connectivity is input to the CSD and the comment might be:

For structure see paper.

(b)
There are certain situations where the algorithm for the matching of crystal and chemical connectivities fails and the corresponding comment might be:

1991 version of the matching program failed.

Graphics QUEST3D Procedure

Select *CCOMMENT from the TEXT sub-menu and respond to the standard text prompts.

Related Keywords

*MATFLAG

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Volume 2 Chapter 11 Text Menu *COMPOUND.