Scheme 3.
Halochromism of RhYK in solution: (a) Ring-opened form (violet-red); (b) Spirolactone form (colorless).
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.