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Cashmeran (CAS 33704-61-9), also known as DPMI (6,7-dihydro-1,1,2,3,3-pentamethyl-4(5H)-indanone), is a synthetic material used in fragrances. It is an alicyclic ketone with the molecular formula C₁₄H₂₂O and a molecular weight of 206 g/mol. Its boiling point has been reported as 256 °C, but in some tests the material decomposed at 220 °C. It was discovered in the 1970s by John Hall at a fragrance house. Its invention came about while researching inexpensive chemical transformations of ingredients from the pentamethyl indane and tetramethyl naphthalene structures. As a result, Cashmeran, an unsaturated ketone, was identified as an important new fragrance ingredient.

Cashmeran is a slight skin irritant and an eye irritant, and a weak sensitiser. It is not classified as toxic, nor is it a CMR substance. Its bioconcentration factor is 156 and its octanol-water partition coefficient (log Kow) is 4.2, so it is neither a very persistent, very bioaccumulative substance nor a persistent bioaccumulating toxic substance. Its bioconcentration and aquatic toxicity are an order of magnitude more favourable than those of the substances considered polycyclic musks, but it carries an environmental hazard classification (H411 under the EU CLP). In most monitoring studies DPMI was not detected, and where trace levels were reported they were below 1 ppm and typically below 1 ppb.

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