1. Recommendations for laboratory testing for acetyl fentanyl and patient evaluation and treatment for overdose with synthetic opioid http://emergency.cdc.gov/han/han00350.asp
2. Acetylfentanyl (N-(1-phenethylpiperidin-4-yl)-N-phenylacetamide) http://www.deadiversion.usdoj.gov/drug_chem_info/acetylfentanyl.pdf
3. DHHS Issues Health Advisory for Deadly New Synthetic Drug http://www.ncdhhs.gov/pressrel/2014/2014-02-19_health_advisory.htm
4. Fentanyl Analogues