Sure, but RC's have been around since forever. I mean MDMA itself was an RC once.
They sound great, though. I once had some pills that I'm fairly sure had MDA in. Both trippier and speedier than MDMA - mad open-eye visuals and proper massive body rush. Fuck, they were good. Never come across it since.
( Mr. Tea 'ulmmm'/'mmneurgh', Fri 21 May 2021, 10:10, archived)

I had a great source of 2cb for a while, loved them

( Queef Smegwin U r a 🔔🔚, Fri 21 May 2021, 10:52, archived)

Only had that a couple of times. Enjoyed it though.

( Mr. Tea 'ulmmm'/'mmneurgh', Fri 21 May 2021, 10:53, archived)