What is the {excipient} with the {MIN(pKa)} whose {has part} is {hydrogen}  ?
What is the excipient with the lowest pKa whose has part is hydrogen ?
select ?ent where { ?ent wdt:P31 wd:Q902638 . ?ent wdt:P1117 ?obj . ?ent wdt:P527 wd:Q556} ORDER BY ASC(?obj)LIMIT 5 
select ?ent where {
?ent <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q902638>.

?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P1117>.
?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj1.

?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?ent .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P527> .
?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q556> .

}
ORDER BY ASC(?obj1)
LIMIT 5
Which excipient with the lowest pKa is partly hydrogen