Write down structure of the following compounds:
2-methyl-2-propene-1,1-dicarboxylic acid

Explanation

To draw the structure of 2-methyl-2-propene-1,1-dicarboxylic acid, we will follow these steps:

### Step 1: Identify the Base Structure
The name "2-methyl-2-propene" indicates that we have a propene structure (3 carbon atoms with a double bond) and a methyl group attached to the second carbon.

**Hint:** Remember that "propene" means a three-carbon chain with a double bond.

### Step 2: Draw the Propene Backbone
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