Draw the structures of the following compounds:
2-keto-3-methylbutanamide

Explanation

To draw the structure of 2-keto-3-methylbutanamide, we will follow these steps:

### Step 1: Identify the Base Structure
The name "butanamide" indicates that the base structure is derived from butane, which has four carbon atoms. The amide functional group (CONH2) is present in this compound.

### Step 2: Determine the Position of the Amide Group
In butanamide, the amide group is typically located at the end of the carbon chain. Therefore, we can represent the structure as follows:
- Carbon 1: Amide group (C=O and NH2)
...