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.
Subclasses of diastereoisomeric 5,8-disubstituted alkaloids. The absolute stereochemistry of 5,9Z-203A and 5,9Z-235B' are as shown, while the structure shown for 5,9E-259B is tentative as postulated based on mass and FTIR spectra [2]. Almost all of the 5,8-disubstituted indolizidines detected in frog skin extracts have proved to be the 5,9Z isomers [2].
