FIG 1.
Chemical structures of 1,4,7-triazacyclononane (TACN) (structure 1), 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) (structure 2), and 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) (structure 3).
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.