Give the IUPAC name of HOOCCH = CHCOOH.

Explanation

To determine the IUPAC name of the compound HOOCCH=CHCOOH, we will follow these steps:

### Step 1: Identify the structure
The given compound can be expanded to show its structure:
- The compound has two carboxylic acid groups (–COOH) and a double bond (C=C) between two carbon atoms.

### Step 2: Count the carbon atoms
Count the total number of carbon atoms in the longest continuous chain:
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