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Proposed steps for the formation of adenine in aqueous ammonium cyanide solution (7, 10–15). Experimentally detected putative intermediates in the abiotic formation of adenine are enclosed in boxes. Two tautomers of AICN can exist; AICN(b) is the more stable. Note that a photoisomerization step is proposed for the formation of AICN from DAMN. DAMN has not been demonstrated to be an adenine intermediate in a nonphotolytic reaction.
