^^By that logic ketamine analogs would be illegal as they are PCP analogs then. phenethylamine is an analog of amphetamine too then?
Yeah, in the US ketamine analogue es are illegal because of their similarity to PCP. When their are multiple scheduled compounds a drug is derived from you don't just get to choose which compound you want it to be an analogue of. Do you seriously believe that if I'm selling deschloroketamine the DEA won't consider it controlled under the analogue act because it might be more similar to ketamine than PCP? Of course they're going to consider it controlled.
Of course if a new compound is an analogue of a schedule III drug, which is itself an analogue of a schedule I drug, the new compound isn't invariably controlled. If there was substantial enough difference in both steps (from CI to CIII and from CIII to New Drug) the new drug might only be an analogue of CIII. It seems unlikely, though.
Phenethylamine is certainly an analogue of amphetamine, but it doesn't produce the same effects as amphetamine without an additional drug being added. It's possible that the DEA would consider it to be an analogue, but it's hard to guess if "substantially similar" counts "substantially similar only if taken with an MAOI.
Whoever said that "it doesn't work that way, that amphetamine is an analogue of phenethylamine, but not the other way around" seriously needs to think harder. PEA is a homologue of AMP, and vice versa. They're analogues of eachother as well.
Edit: Additionally, as I said earlier, it's most likely a partial agonist because of the n-cyclopropylmethyl group, similar to buprenorphine. I would be a bit surprised if it were an antagonist, though.