Figure 13.
Syntheses of fentanyl derivatives A) F09 and F13, B) F02 C) F07 and F08.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.