DBpedia SPARQL query that has a period in it

I'm trying to get the abstract of the Manchester United soccer team, problem is the wiki link has periods in it. When I tried this,

开发者_JAVA百科PREFIX dbp: <http://dbpedia.org/resource/>
PREFIX dbp2: <http://dbpedia.org/ontology/>

SELECT ?abstract
WHERE {
    dbp:Manchester_United_F.C.
    dbp2:abstract ?abstract . 
    FILTER langMatches(lang(?abstract), 'en')
}

It returned an error because of the period after F.C.

Any ideas on how to fix this?

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From what I've seen in the SPARQL grammar, you might need to expand the prefix to get <http://dbpedia.org/resource/Manchester_United_F.C.> as your reference.