Wiktionary
                    pentanone
                    
                        
                
                                                                    n. (context organic compound English) Any of three organic compounds containing five carbons and a ketone functional group.
Wikipedia
                    Pentanone
                    
                        
                
                                                                    Pentanone may refer to the following ketones containing five carbon atoms:
- 
 2-Pentanone (Methyl propyl ketone, MPK)
- 3-Methyl-2-butanone (Methyl isopropyl ketone, MIPK)
 
 - 3-Pentanone (Diethyl ketone, DEK)