Table 1.

Characterization of substrates and reaction products by MALDI-TOF MS

Compound	Species	Mass, calculated	Mass, observed
Substrates
IT1-SNAC	[M+H]+	1,221.6	1,221.5
IT2-SNAC	[M+H]+	1,207.6	1,207.2
IT3-SNAC	[M+H]+	836.5	836.6
Products
IT1-COOH	[M+H]+	1,120.6	1,120.5
cyclo-IT1	[M+H]+	1,102.6	1,102.6
IT2-COOH	[M+H]+	1,106.6	1,106.5
cyclo-IT2	[M+H]+	1,088.6	1,088.5
IT3-COOH	[M+H]+	735.5	735.5
cyclo-IT3	[M+H]+	717.5	717.5