A group of phenethylamine derivatives referred to as the FLY compounds, named for their insect-like appearance of two “wing-like” furan or dihydrofuran rings fused on the opposite sides of the central benzene ring, have been identified with allegedly potent hallucinogenic effects. 2C-B-FLY is the dihydrodifuran analog of the Schedule I hallucinogen 4-bromo-2,5-dimethoxyphenethylamine (2C-B). It is expected to show similar activity to 2C-B, which acts as a partial agonist at the 5-HT2A serotonin receptor and demonstrates high binding affinity for the 5-HT2B and 5-HT2C serotonin receptors. This product is intended for forensic and research purposes.