Fentanyl analogs h?v? k?ll?d hundr?d? of ????l? thr?ugh?ut Eur??? as well as f?rm?r S?v??t republics considering that th? most up-to-date r??urg?n?? ?n use began ?n E?t?n?? ?n the early 2000?, ?nd n?v?l d?r?v?t?v?? ??nt?nu? t? seem.Synthetic fentanyl and fentanyl analogues are commonly utilized between researchers and laboratory workers. We provide