Precursor ions in daughter scan of ATZ and its intermediates; molecular weight (MW), formula, proposed structure and chemical name for the intermediates of ATZ in UV/H₂O₂ process.

Name	ESI model	MS fragment ions (m/z)	Precursor ions (m/z)	MW (Da)	Formula	Proposed structure	Chemical name
P12	ESI+	168, 152, 123, 115	210	209	C8H11N5O		2-Hydroxy-4-acetamido-6-isopropenylenylamino-s-triazine
P13	ESI+	97, 139	139	138	C5H6N4O		4-Acetamido-s-triazine
P14	ESI+	184, 170, 142, 100, 85, 68	212	211	C8H13N5O2		2-Hydroxy-4-acetamido-6-(2-hydroxyisopropylamino) -s-triazine
	ESI−	182, 166, 136, 115, 111, 98	210
P15	ESI+	170, 103, 86	212	211	C8H13N5O2		2-Hydroxy-4-ethylimine-6-(2-hydroxyisopropylamino) -s-triazine
	ESI−	167, 152, 123, 115, 101, 66	210
P16	ESI+	173, 214	214	213	C7H8N5OCl		2-Chloro-4-vinylamino-6-acetamido-s-triazine
P17	ESI+	196, 170, 143, 129	214	213	C8H15N5O2		2-Hydroxy-4-(2-hydroxy-ethylamino)-6-isopropylamino-s-triazine
P18	ESI+	214	214	213	C8H15N5O2		2-Hydroxy-4-ethylamino-6-(2-hydroxyisopropylamino) -s-triazine
P19	ESI+	218, 154, 127	196	195	C8H13N5O		2-Hydroxy-4-ethylamino-6-isopropenylenylamino-s-triazine
P20	ESI+	172, 194	172	171	C5H9N5O2		2-Hydroxy-4-(2-hydroxy-ethylamino)-6-amino-s-triazine
	ESI−	170	170
P21	ESI+	172, 194	172	171	C5H6N5Cl		2-Chloro-4-vinylamino-6-amino-s-triazine
	ESI−	170	170