API
IMPURITY
CHEMICAL NAME
STRUCTURE
2
Fentanyl

EP Impurity B

N-phenyl-N-(piperidin-4-yl)propanamide Fentanyl-EP-Impurity-B
Fentanyl

EP Impurity E

benzaldehyde Fentanyl-EP-Impurity-E
Fentanyl

EP Impurity F

aniline (phenylamine),
Fentanyl

EP Impurity G

N-phenylpropanamide Fentanyl-EP-Impurity-G
Fentanyl

Fentanyl Related Compound A

(2-bromoethyl)benzene Fentanyl-Related-Compound-A