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