I'm unsure what you mean; your post is in broken English and makes little sense. Are you asking if you could sell people 4-mmc (Mephedrone) instead of MDMA?
Edit: closing this because it sounds like you are in fact trying to sell people mephedrone as MDMA. Whilst they do have similarities, they are also worlds apart, and any seasoned MDMA user would know that. Selling mephedrone as MDMA is not only dangerous and morally corrupt, but ultimately snidey and will probably drive people away from you.
Regardless, we can not advise you on selling drugs, for numerous obvious reasons. If I've interpreted your message incorrectly, feel free to drop me a PM.