The molecule is the ammonium ion formed from 4-amino-5-aminomethyl-2-methylpyrimidine by protonation of the primary amino group; principle microspecies at pH 7.3. It is a conjugate acid of a 4-amino-5-aminomethyl-2-methylpyrimidine.
(4-amino-2-methylpyrimidin-5-yl)methylazanium