Question: Tell me the class lllb with the highest exposure limit whose safety is labelling standards.
Paraphrase: What is the highest exposure limit of class IIIb that is considered safe per labelling standards?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009059 . ?ent wdt:P2405 ?obj . ?ent wdt:P4952 wd:Q51139288 } ORDER BY DESC(?obj)LIMIT 5 
Answer: disulfur dichloride, o-anisidine, toluene 2,4-diisocyanate, toluene 2,4-diisocyanate