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The charge is applied to the oxygen atom. Its<br />

atom type changes and a hydrogen atom is<br />

removed.<br />

For amino acids that repeat, put parentheses<br />

around the repeating unit plus a number rather than<br />

type the amino acid repeatedly. For example, type<br />

HAla(Pro)10GlyOH.<br />

4. Press the Enter key.<br />

The substructure replaces the selected atom.<br />

For example, to change benzene to biphenyl:<br />

1. Click the atom to replace.<br />

A text box appears.<br />

Example 4. Other Polymers<br />

The formation of a PET (polyethylene<br />

terephthalate) polymer with 4 units (a.k.a.: Dacron,<br />

Terylene, Mylar) ia shown below:<br />

• Type OH(PET)4H into a text box with no<br />

atoms selected and press the Enter key.<br />

The H and OH are added to cap the ends of the<br />

polymer.<br />

2. Type Ph.<br />

3. Press the Enter key.<br />

Replacing an Atom with a<br />

Substructure<br />

The substructure you use must have the same<br />

number of attachment points as the atom you are<br />

replacing. For example, if you try to replace a<br />

carbon in the middle of a chain with an Ethyl<br />

substructure, an error occurs because the ethyl<br />

group has only one open valence and the selected<br />

carbon has two.<br />

To replace an individual atom with a substructure:<br />

1. Click the Text tool.<br />

2. Click the atom to replace.<br />

A text box appears.<br />

3. Type the name of the substructure to add<br />

(case-sensitive).<br />

Building From Tables<br />

Cartesian Coordinate tables and Z-Matrix tables<br />

can be saved as text files or in Excel worksheets.<br />

(See “Z-matrix” on page 24 and “Cartesian<br />

Coordinates” on page 24 for more information.)<br />

Likewise, tables from text files or worksheets can be<br />

<strong>ChemOffice</strong> 2005/Chem3D Building and Editing Models • 59<br />

Building From Tables

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