Find all chemicals according to an introduced name

Database: 
Statement: 

$term$
$number$

Query: 
PREFIX stitch: <http://wifo5-04.informatik.uni-mannheim.de/stitch/resource/stitch/> SELECT DISTINCT ?s ?name WHERE { ?s rdf:type stitch:chemicals . ?s stitch:name ?name . Filter regex (?name, "??term", "i") . } LIMIT ??number