HELP! Unidentifiable substance.

So this guy has been given a substance claiming to be (in their words) “it’s like 1 or 2 steps away from ephedrine you just have to gas it blah blah. Sounded like they had no idea what they were talking about.

I have spent some time researching and came to the conclusion that it was Methcathinone, but after doing some investigative work with a few easily accessible solvents Iv come to the conclusion it’s not that, and investigation only led to a lot more confusion and questions. So here’s what iv figured out...

And please, I am a complete amateur so if you notice anything that is not correct feel free to correct me but I would like referencing and explanation why if need be.
More so am doing this as a way to learn. Cheers
$SOLVENTS USED$

(HCl) hydrochloric: polar_non alkaline_water soluble_low pH...

Shellite: non polar_non alkaline_not water soluble_high ph...

Methylated spirits: non polar_non alkaline_water and solvent soluble_neutral ph...

Acetone partially polar_non alkaline_water and solvent soluble...

$UNIDENTIFIABLE SUBSTANCE$

Unidentifiable substance_not soluble in water acetone or methylated spirits_soluble in Shellite_smells acidic_smells oddly sweet almost a cherry like smell.....

unidentifiable substance dissolved in shellite and precipitated with HCl acid and poured off.. was left with a substance that is slightly soluble in water with lots of agitation-soluble in methylated spirits with agitation, and held the same smell and colour. Was just now in powder form and not crystal form,

If you have any questions that might help as to working wtf this stuff is that would be great coz I’m stumped

 

It's a trap

 

No trap here and I hope not too die anytime soon at least after I have worked out what this shit is, if anyone can point me in the right direction to work out what this stuff is that would be awesome and greatly appreciated,

 

It's a USO.

 

What’s a ”USO”