11823
However , the IUPAC recommends using name " alkene " only for acyclic hydrocarbons with just one double bond ; " alkadiene " , " alkatriene " , etc. , or " polyene " for acyclic hydrocarbons with two or more double bonds ; " cycloalkene " , " cycloakadiene " , etc .
 IUPAC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 IUPAC