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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)