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.
X-ray molecular structures of Passerini 5 (left) and Ugi 6 (right) adducts. The ORTEP plot is at the 30% probability level. Hydrogen atoms, except those of the NH fragments, that of the OH group in 6 and that linked to C2 in 5, have been omitted for the sake of simplicity.
