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ChemOffice.Com - CambridgeSoft

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A box or oval indicates the position of the<br />

fragment while you are moving it.<br />

TIP: You can rotate a fragment separately from the<br />

whole model by selecting at least one atom in it and using<br />

the Shift key with the trackball tool. Try this to reorient<br />

the fragments as in the illustration below.<br />

The icon on the fragment changes to a target.<br />

3. Select the Methamphetamine fragment.<br />

TIP: The check in the box next to Methamphetamine<br />

does not mean that it is selected, it means that it is<br />

visible. (Try it. This is how you work with multiple<br />

overlays.) You must click on the fragment name for the<br />

Fast Overlay command to become active.<br />

At this point, you have to decide which of the<br />

fragments will be the target. In this simple example,<br />

with only two compounds, it doesn’t really matter.<br />

You might, however, have cases where you want to<br />

overlay a number of compounds on a specific<br />

target. Chem3D allows multiple overlays. The<br />

Model Explorer makes it easy to hide compounds<br />

you are not actively working with, and to display<br />

any combination of compounds you want.<br />

4. Choose Fast Overlay from the Overlay<br />

submenu on the context menu.<br />

The fragments are overlaid. The numbers show<br />

the serial numbers of the target atoms that the<br />

matching overlay atoms correspond to.<br />

TIP: You can designate a group, rather than the entire<br />

fragment, as the target. In some cases, this will give more<br />

useful results.<br />

1. Click the Epinephrine fragment to select it.<br />

2. Point to Overlay on the context (right-click)<br />

menu, and click Set Target Fragment.<br />

To turn off the Fast Overlay mode:<br />

• Choose Clear Target Fragment from the<br />

Overlay submenu.<br />

<strong>ChemOffice</strong> 2005/Chem3D Chem3D Tutorials • 41<br />

Tutorial 6: Overlaying Models

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