Question: What is the excipient with the highest time-weighted average exposure limit whose safety classification and labelling is Regulation (EC) No. 1272/2008 ?
Paraphrase: What is the excipient whose safety classification and labeling is Regulation (EC) No 1272/2008 with the highest time-weighted average exposure limit?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q902638 . ?ent wdt:P2404 ?obj . ?ent wdt:P4952 wd:Q2005334 } ORDER BY DESC(?obj)LIMIT 5 
Answer: acetone, acetone, acetone, acetone, acetone