fund is a plus. fun for your self and society.

Due to case sensitive of SPARQL query, we should employ REGEX operator to avoid String comparison between rdfs:label. The following is simple example to solve that :

select *  
{ 
?sider a  <http://www4.wiwiss.fu-berlin.de/sider/resource/sider/drugs> . 
?sider <http://www.w3.org/2000/01/rdf-schema#label> ?sidername . 
FILTER regex(str(?sidername),"Acetaminophen","i") 
}