Table 1.

LC-MS Analysis of the Reaction of C-Nitroso Compounds and HNO Donors and AIDH peptide A2B5-R3OT.

Reagent	Retention Time (min)	m/z	Product(s)
---	6.98	1186.5573 [M+2H]+2	unreacted peptide
NB	7.17	1240.0791 [M[N-phenyl sulfinamide + 2H]+2	N-phenyl sulfinamide
5	7.54	1185.5496 [M(RSSR) + 4H]+4	RSSR
AS (10eq.)	6.82	1192.0491 [M(dhA)+2Na]+2	dhA -major
	6.94	1202.0620 [M(sulfinamide + 2H]+2	sulfinamide-minor
AS(1000 eq.)	6.89	1202.0613 [M(sulfinamide + 2H]+2	sulfinamide
15N-AS (1000 eq.)	6.91	1202.5616 [M(15Nsulfinamide + 2H]+2	15Nsulfinamide
5 + PLE	7.52	1185.5514 [M(RSSR) + 4H]+4	RSSR
	6.92	1202.0618 [M(sulfinamide + 2H]+2	sulfinamide