What is the {chemical compound} for {monomer of} of {polyvinyl chloride}
What is the chemical formula of PVC?
 select distinct ?sbj where { ?sbj wdt:P4599 wd:Q146368 . ?sbj wdt:P31 wd:Q11173 } 
select distinct ?subj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?subj . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P4599> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q146368> . ?subj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q11173> } 
What is the chemical equation of PVC?