| Cg,1 Cg2 and Cg3 are the centroids of the C27–C32, C17–C22 and S1/C1/C6/N1/C7 rings, respectively. |
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.