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4. Type Ph(NO2) in the text box.<br />

5. Press the Enter key.<br />

A model of nitrobenzene appears.<br />

The substructure in this example is the phenyl<br />

group. Substructures are defined with specific<br />

attachment points for other substituents. For<br />

phenyl, the attachment point is C(1).<br />

3. Select the Trackball tool , and rotate the<br />

model so you are viewing it down the center of<br />

the helix as shown below:<br />

Build a peptide model:<br />

1. From the File menu, choose New.<br />

2. Click the Text Building tool .<br />

3. Click an empty space in the Model window.<br />

A text box appears.<br />

4. Type H(Ala)12OH.<br />

5. Press the Enter key.<br />

6. Rotate this structure to see the alpha helix that<br />

forms.<br />

Change the model display type:<br />

1. Click the arrow on the right side of the<br />

Model Display Mode tool on the Model<br />

Display toolbar.<br />

2. Select Wire Frame as the Model Type.<br />

TIP: You can also click on the icon. Successive clicks<br />

cycle through the Display Mode options.<br />

4. Use the Model Display Mode tool to choose<br />

Ribbons as the Model Type to see an alternative<br />

display commonly used for proteins.<br />

Tutorial 4: Examining<br />

Conformations<br />

This tutorial uses steric energy values to compare<br />

two conformations of ethane. The conformation<br />

with the lower steric energy value represents the<br />

more likely conformation.<br />

Build ethane:<br />

1. Draw a single bond in the ChemDraw panel.<br />

A model of ethane appears.<br />

2. View the Measurements table:<br />

a. From the Structure menu, point to<br />

Measurements, and then choose Bond<br />

Lengths.<br />

<strong>ChemOffice</strong> 2005/Chem3D Chem3D Tutorials • 35<br />

Tutorial 4: Examining Conformations

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