The Federal Analogue Act, as an example, preemptively bans any isomer of a recognized restricted chemical. This can make it very difficult for drug producers to provide new amphetamine analogs like 2-MMC legally. In its pellet type, Flunitrazolam seems as tiny, round tablets using a higher level of purity, https://chemwizards.ca/product/2-mmc-pellets-180mg-2/