Complex Substituents If the branch has a branch,number the carbons from the point of attachment. Name the branch off the branch using a locator number. Parentheses are used around the complex branch name. 1-methyl-3-(1,2-dimethylpropyl)cyclohexane => Chapter 3 13 Chapter 3 13 Complex Substituents • If the branch has a branch, number the carbons from the point of attachment. • Name the branch off the branch using a locator number. • Parentheses are used around the complex branch name. 1 2 3 1-methyl-3-(1,2-dimethylpropyl)cyclohexane =>