Question: Name the lethal excipient mad eof chemical compound ?
Paraphrase: What's the lethal excipient  of chemical compound?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q902638 . ?ent wdt:P2300 ?obj . ?ent wdt:P31 wd:Q11173 } ORDER BY DESC(?obj)LIMIT 5 
Answer: acetone, acetone, acetone, acetone, acetone