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ESIMS characterization of the support-bound nucleotides indicated in Scheme 3.
| Compound | Calculated mass | Observed mass |
| 7a | 2060.0 [(M − 2H)/2]2− | 2059.9 [(M − 2H)/2]2− |
| 7b | 1455.3 [(M − 2H)/2]2− | 1455.2 [(M − 2H)/2]2− |
| 8a | 3067.7 [(M − 2H)/2]2− | 3067.7 [(M − 2H)/2]2− |
| 8b | 2462.9 [(M − 2H)/2]2− | 2462.7 [(M − 2H)/2]2− |
| 9 | 2724.6 [(M − 3H)/3]3− | 2724.5 [(M − 3H)/3]3− |
