On the demand side, one market that used to pull CBN closed this year.
CBN became a designated substance in Japan on 1 June 2026, covering manufacture, import, sale, possession and use. The prohibition is written against products containing CBN and there is no published concentration threshold attached, so it isn’t a spec problem you can engineer around, and material carrying CBN as a minor is caught the same way as CBN sold as CBN.
Relevant to the homologs specifically: Japan schedules both named compounds and substance groups defined by structure, so a chain-length variant is not automatically outside the net. Separately, the abbreviations in your title aren’t defined consistently anywhere I can find, which becomes its own problem the moment someone asks whether a given jurisdiction covers them. I went into that over here rather than repeat it:
No comment on the synthesis, which is the interesting half of this thread. Just flagging that if any of the demand you were sizing was Japanese, that part of the map has changed.