Write the systematic IUPAC names of the following compounds :
`CH_3 - overset(O) overset(||) C -CH_2 - overset(O ) overset(|| ) C - OC _2H_5 `

Explanation

To determine the systematic IUPAC name of the given compound, we will follow these steps:

### Step 1: Identify the longest carbon chain
The structure provided is:
```
CH3 - O=C - CH2 - O=C - O - C2H5
```
In this structure, we can see that there are four carbon atoms in the longest continuous chain.
...