Spanish to English Science Chemistry; Chem Sci/Eng

Hi everyone

I am translating the description of a skincare product and I have come across the phrase:

El ácido ascórbico o vitamina C es una querolactona, estructuralmente similar a la glucosa, con diversas funciones fisiológicas

But I have no idea what "querolactona" means and it does not appear in any dictionaries or on google. Any ideas?

Many thanks

Penny