Table 1.

MS/MS fragmentation sequencing data of HECI.

#1	b(1+)	b(2+)	Seq.	y(1+)	y(2+)	#2
1	102.055	51.531	T			17
2	201.123	101.065	V	1849.961	925.484	16
3	314.207	157.607	L	1750.892	875.950	15
4	470.309	235.658	R	1637.808	819.408	14
5	527.330	264.169	G	1481.707	741.357	13
6	630.339	315.673	C	1424.685	712.846	12
7	816.419	408.713	W	1321.676	661.342	11
8	917.466	459.237	T	1135.597	568.302	10
9	1064.535	532.771	F	1034.549	517.778	9
10	1151.567	576.287	S	887.481	444.244	8
11	1298.635	649.821	F	800.449	400.728	7
12	1395.688	698.348	P	653.380	327.194	6
13	1492.741	746.874	P	556.328	278.668	5
14	1620.836	810.921	K	459.275	230.141	4
15	1717.888	859.448	P	331.180	166.094	3
16	1820.898	910.952	C	234.127	117.567	2
17	—	—	I-Amidated	131.118	66.063	1

Through CID collision, the parent ion was fragmented into singly/doubly charged ions. The observed m/z ratios of b-ions y-ions are single-underlined.