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ESI-TOF mass spectrum of the hydrolysis fragments formed from (a) the 5′-exonuclease digestion of product 1 acquired after 30 min; (b) the hydrolysis fragments formed from the 3′-exonuclease digestion of product 1 after 40 min; (c) the hydrolysis fragments formed from the 3′-exonuclease digestion of product 4 after 40 min.
