I have large list of chemicals with common drug names and pubchem CIDs. I want to add the Anatomical Therapeutic Chemical (ATC) Classification System -codes (ATC codes), for each one of them. I notice that pubchem provides this info in the compound summary page. Is there a way to do batch query and obtain ATC codes? (or) is there any website or tool to get this info,i.e., given a pubchem CID obtain ATC codes?