Name the least flammable nitrogen-containing class IIIB combustible liquid
select ?ent where { ?ent wdt:P31 wd:Q21009059 . ?ent wdt:P2202 ?obj . ?ent wdt:P527 wd:Q627. } ORDER BY ASC(?obj)LIMIT 5 
class iiib combustible liquid: Q21009059 nitrogen: Q627