Substituted amphetamines were already very popular in the 1950s.
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As I understand it, the aspartate and saccharate still dissociate in solution. If so, there isn't much of a plausible reason to consider them different drugs. If not, they might act more slowly or not at all.
None of this puts Adderall in the class of substituted amphetamines like MDMA or Desoxyn or exotics like ALEPH: https://www.erowid.org/library/books_online/pihkal/pihkal003...