. "synthetic nucleobases" . "6MAP" . . "analogues" . . . "Nucleic acid analogue#Base analogues" . . "Nucleic acid analogue" . "Pyrrolo\u2011C" . "nucleotide analogues" . . "nucleic acid analog" . "unnatural nucleotides" . "synthetic nucleosides" . "Nucleic acid analogue" . "synthetic DNA analog" . "alternative" . "nucleic acid analogue" .