Question: Which metabolite has the largest mass?
Paraphrase: Metabolite with the largest mass is?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q407595 . ?ent wdt:P2067 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: ganglioside gm1 (stereochemistry specified), 3-oxooctanoyl-CoA, NADPH, NAD+, NAD+