Read the following paragraph and answer the question. Give ONLY the answer, no other words or explanation.

For example:

Answer: <most likely answer, as short as possible>.

Paragraph: 
The anion is the methanoate ion, which is commonly called the formate ion. One reaction to consider is that of a carboxylic acid and an alcohol. When combined under the proper conditions, a water molecule will be removed, and the remaining pieces will combine to form a new functional group—the ester functional group:.


Question: The anion is the methanoate ion, which is commonly called the what?
formate ion
formate ion.