Table 1. SORI-CAD MS/MS results of the [M – H]^– ion of d(C^∧pC).

	Calculated mass	Measured mass	Deviation (p.p.m.)
[M – H]–	513.1135	513.1154	3.7
		513.1125	–1.9
		513.1156	4.1
H2O loss	495.1029	495.1039	2.0
		495.1041	2.4
		495.1030	0.2
Deoxyribose loss	415.0767	415.0767	0.0
		415.0769	0.5
		415.0763	–1.0
(Deoxyribose + HPO3 + H2O) loss	317.0998	317.0999	0.3
		317.1002	1.3
		317.0995	–0.9
Base loss	293.0426	293.0427	0.3
		293.0428	0.7
		293.0423	–1.0
[Base – H]–	219.0630	219.0624	–2.7
		219.0626	–1.8
		219.0625	–2.3
[Deoxyribose + HPO3 + H2O – H]–	195.0059	195.0055	–1.8
		195.0056	–1.3
		195.0054	–2.3

Data were obtained from three independent measurements.