Working with abbreviated groups

Place an abbreviated group to the canvas

• Insert an abbreviated group into your sketch

1. Type the name of the abbreviation.

2. Click on the canvas to place it.

To complete a longer name, press ENTER or END after typing the first few characters.

If the cursor was placed over an atom, it will be automatically changed to the abbreviated group.
If no atom was selected, the abbreviation is placed on the cursor. Clicking with it places it on the canvas.
To ungroup an S-group before placing it to the canvas, press the SHIFT button before you release the mouse on the desired location.

You can retrieve the hidden structure from the text abbreviation with the "Expand" function and hide the structure with the "Contract" function.

Manipulation with abbreviated groups is possible with "Expand", "Contract", "Ungroup", and "Remove" options from the Structure > Group submenu or by right-clicking for the contextual menu on an existing group. For hints how you can customize the Editor see the Customize MarvinGUI section.

Contract: if there is one group selected contracts to its abbreviation, otherwise contracts all groups in the canvas.
Expand Group: displays the full structure instead of a contracted group if there is one group selected, otherwise expands all groups in the canvas.
Ungroup: removes all abbreviated groups from the selection or from the canvas. The structures will remain, but will no longer be associated with their abbreviations.

Add/Remove attachment points to abbreviated groups

After creating the abbreviated group (see previous section), right-click the corresponding atom and choose Add S-group attachment or select the atom and use the same option in the Atom menu.

The attachment point is marked by a number in a green rectangle. The display of the attachment point(s) can be switched off from the View<Advanced submenu.
There is no limit to how many attachment points can be added to an abbreviated group; they will be numbered in the order of their creation. Similarly, an atom of the abbreviated group can have more attachment points.

Bonds will connect to group atoms through their first free attachment point ( with the exception of amino acids).

Only attachment points not involved in bonds are marked by numbers in the expanded abbreviated group.

To removal an attachment point select the Remove S-group attachment option either from the contextual pop-up menu or from the Atom menu. If the selected atom has more than one attachment points they are deleted in descending order.

Create an abbreviated group

Besides the default abbreviated groups you can also set up your own user-defined groups or redefine the default ones.

To create a new abbreviated group

1. Click the Group button in the Tools toolbar then select the group atoms and bonds. or upon releasing the mouse button, the "Create group" dialog window pops up (this dialog window may be opened from the Structure > Group submenu as well or use the CTRL+G shortkey.

2. Name the group in the dialog window.

3. To format you abbreviated group use the Atom Label editor tool.

Add abbreviated groups to the Template Library

The abbreviated groups can be added to the Templates.

1. Select the group.

2. Right-click and select "Add to My Templates" from the contextual menu.

The structure is added to the Advance Template Toolbar by default.

Format default and user-defined abbreviated groups

The Atom label editor tool allows you to change characters to bold, italic, super- and subscript and insert symbols.

Color, font type and size can be set using the Format... option from the contextual menu.

User-defined abbreviated groups

Marvin stores its default groups in a formatted .txt file named default.abbrevgroup and by adding your own group file you can complement the default.

To assemble your own .abbrevgroup file you should strictly follow abbreviated groups file format.

The newly defined file must be named user.abbrevgroup and should be stored in the chemaxon folder of your home directory in your file system.

A very basic process to create user-defined abbreviated group is:

1. Clear the canvas.

2. Draw the structure.

3. Select the structure and using the 'Create Group' dialog name it.

4. Add attachment point. - Optional (Select the atom and click the Add S-group attachment from the contextual menu.)

5. Copy the content of Edit<Source<View<SMILES<Chemaxon SMILES Abbreviated Groups dialog to a text editor. (For more options see the abbreviated group file formats.)

   1. If you do not have user.abbrevgroup file than save it to your Chemaxon folder

   2. If your already has created user-defined abbreviated groups copy the content of the dialog box to your file.