What is the China National Petroleum Corporation headquarters location that is located at 9 Dongzhimen North Street, Dongcheng District?
SELECT ?obj WHERE { wd:Q588786 p:P159 ?s . ?s ps:P159 ?obj . ?s pq:P969 ?x filter(contains(?x,'9 Dongzhimen North Street, Dongcheng District')) }
china national petroleum corporation: Q588786