What is the {chemical substance} for {named after} of {Physeter macrocephalus}
What chemical substance is named after sperm whales?
 select distinct ?obj where { wd:Q81214 wdt:P138 ?obj . ?obj wdt:P31 wd:Q79529 } 
select distinct ?obj where { ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q81214> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P138> . ?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj . ?obj <http://www.wikidata.org/entity/P31> <http://wikidata.dbpedia.org/resource/Q79529> } 
Give me the name of the chemical substance named after sperm whales?