Figure 2.
Carbon numbering used for the assignment of 1H NMR and 13C NMR signals of 4f and 5f.
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.