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.
Proposed mechanism for the fragmentation of b62+ product ions of doubly protonated RVYIHAF. Following cleavage of the Ala-Phe bond to produce an oxazolone b62+ product ion, nucleophilic attack by the histidine imino nitrogen on the electropositive carbon of the oxazolone occurs. This results in a b52+ fragment ion with same structure as the b52+ ions shown in Scheme 2.
