3-Chloromethcathinone, or 3-CMC since it is commonly known, is a cathinone class research chemical. The core structure of this subcategory, also known as cathinone, is similar to that of bupropion. In terms of pharmacology, however, 3-CMC is different from bupropion.

The use of the beta carbon in the amphetamine structure allows for the discovery of cathinones such as 3 CMC by means of kettone substitution. Two methyl substitutions can be found in the 3-CMC cathinone structure, one at the phenyl rings and one at the nitrogen group. Mephedrone is very similar to 3-CMC in structure. Only difference is where the methyl groups are placed. The price for this particular specimen is R3, while mephedrone is R4.