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