Are there any chemistry research classification systems?

There are research classification systems for mathematics ([MSC](https://en.wikipedia.org/wiki/Mathematics_Subject_Classification)) and physics ([PACS](https://en.wikipedia.org/wiki/Physics_and_Astronomy_Classification_Scheme) and subsequently [PhySH](https://en.wikipedia.org/wiki/PhySH)) which help the researchers to navigate through codes composed by letters/numbers made by associations that specialise in those pieces of human knowledge. Are there any classification systems of research in chemistry?


