Scheme 2.
Synthesis of compounds 28a−28k, 29a−29o, 30a−30o, 31, 32 and 33a−33m.
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.