You're right, the formula C12H22O11 represents a disaccharide, meaning it's made up of two monosaccharides. Here are three important disaccharides with this formula:

1. Sucrose: This is the most common disaccharide and is often referred to as table sugar. It's made up of glucose and fructose.

2. Lactose: This is the sugar found in milk and dairy products. It's composed of glucose and galactose.

3. Maltose: This disaccharide is formed from two glucose molecules and is found in germinating grains. It's often used in brewing and baking.