What is {median lethal dose} of {fentanyl} that is {applies to part} is {laboratory rat} ?
how much fentanyl is needed to kill a laboratory rat?
What is the median lethal does of fentanyl for a laboratory rat?
SELECT ?z WHERE { resource:fentanyl property:median_lethal_dose_(LD50) ?w . ?w property:median_lethal_dose_(LD50) ?z . ?w property:applies_to_part resource:laboratory_rat }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q407541> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2240> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P518> <http://wikidata.dbpedia.org/resource/Q3089676>
} 

SELECT ?obj WHERE { wd:Q407541 p:P2240 ?s . ?s ps:P2240 ?obj . ?s pq:P518 wd:Q3089676 }