Recently purchased to capsules filled with a fine off-white/purple powder???

Scored it in New Orleans,Took the powder out of the capsule, and it had a very salty taste, too harsh to snort so i poored it into a cup of water and drank it. The high felt very similar to MDMA, but not very long lasting, and a very smooth comedown. i bought two capsules for 25$. Any thoughts on what this may have been?
Any speculation is appreciated.
 
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