Butanone

Butanone (Bethany Keaton) or Methyl Ethyl Ketone (MEK) is the second Ketone.

Butanone spends her whole life in industry. Butanone has some skeletal defects, humans in industry make fun of her.

Personality
Toluene is Butanone's best friend and co-worker, he is concerned for her. Butanone smokes and suffers from depression.

Relationships
MEK is Acetone's cousin. She's jealous of Acetone, they have really different lives. That's probably why she will "never be like Acetone and never be loved". Butanone is a sweet person and very much like Acetone.