My goodness they are scraping the barrel with these bath salts. No doubt next we will see the methyl ethyl homologues and then the diethyl homologues (you can't go any bigger without falling of an activity cliff). Then no doubt they will introduce terminal fluorines (if they haven't already) and do the whole damned thing again. Markush structures needed here.
I really do not recommend any of these compounds. You can only push so far into the unknown without falling onto your equivalent of the thalidomide disaster.
I strongly recommend people don't take this stuff. It seems to me that no medicinal chemist has been involved in their design. There are so many easier ways to get back to a LEGAL MDMA-like compound and a LEGAL stimulant compound. Ones that have been patented. Ones where properly qualified people carried out properly constructed testing.