D 2242 (OTTO) Dipentene Cas 138-86-3 - used as a solvent for cleaning purposes, such as the removal of oil from machine parts, as it is produced from a renewable source (citrus oil, as a byproduct of orange juice manufacture). D 2242 (OTTO) Dipentene Cas 138-86-3 - used as a paint stripper and is also useful as a fragrant alternative to turpentine.