The introduction of fluorine, as found while in the structure of 2/3-FEA, is a typical modification in medicinal chemistry to change the properties of a compound. It could likely influence the compound’s conversation with receptors and transporters in the Mind, leading to modifications in the release and reuptake of neurotransmitters. https://chemwizards.ca/product/2-3-fea-pellets-40mg-120mg/