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. 2007 Oct 19;104(44):17272–17277. doi: 10.1073/pnas.0708434104

Fig. 4.

Fig. 4.

Gas-phase reaction profile [B3LYP/6-31G*] for adenine formation from the less stable AICN(a) isomer, when one explicit H2O molecule is included as catalyst. This pathway is precluded by a second high reaction barrier.