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.
R symbolizes hydrogen for HL1 and 1, 3-fluoro for HL2 and 2, 2-chloro for HL3 and 3, 3-chloro for HL4 and 4, 2-methoxy for HL5 and 5, 3-methoxy for HL6 and 6, 4-methoxy for HL7 and 7, 4-hydroxy for HL8 and 8 and 4-methyl for HL9 and 9.
