[{"from": "human", "value": "Describe this molecule. [C][=C][Branch2][Ring2][Ring2][C][=C][Branch2][Ring1][Branch1][N][Ring1][Branch1][C@H1][C@@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][Branch1][C][O][O][O][N][=C][Branch1][=Branch1][N][C][Ring1][S][=O][N][C][=Branch1][C][=N][N]"}, {"from": "gpt", "value": "The molecule is a 7-deazaguanine ribonucleoside having 7-formamidino-7-deazaguanine as the nucleobase. It is found in the majority of archaeal tRNAs specifically at position 15 of the dihydrouridine loop (D-loop), a position not modified in either eukaryotic or bacterial tRNA. It is functionally related to a 7-formamidino-7-deazaguanine."}]