What is the {citrate anion} for {conjugate base} of {citric acid}
What is the conjugate base of Citric Acid?
who citrate anion for conjugate base of citric acid?
SELECT DISTINCT ?x WHERE { resource:citric_acid property:conjugate_base ?x . ?x rdf:type ontology:citrate_anion }
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q159683> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4149> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q55502846> } 
 select distinct ?obj where { wd:Q159683 wdt:P4149 ?obj . ?obj wdt:P31 wd:Q55502846 } 