What's the plural form of methanethiol? Here's the word you're looking for.
Answer
The noun methanethiol can be countable or uncountable.
In more general, commonly used, contexts, the plural form will also be methanethiol.
However, in more specific contexts, the plural form can also be methanethiols e.g. in reference to various types of methanethiols
or a collection of methanethiols.