Question: Which fluorine-containing heterocyclic compound has the largest mass ?
Paraphrase: Which heterocyclic compound contains fluorine and also has the largest mass?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q193430 . ?ent wdt:P2067 ?obj . ?ent wdt:P527 wd:Q650 } ORDER BY DESC(?obj)LIMIT 5 
Answer: astemizole, fluphenazine, iloperidone, risperidone, trifluperidol