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From the abstract: “Using structure generation methods, we explore nucleic acid analogues within the formula ranges BC3–7H5–15O2–4 and BC3–6H5–15N1–2O0–4, where B is a recognition element (e.g., a nucleobase). Other restrictions included two obligatory points of attachment for inclusion into a linear polymer and substructures predicting chemical stability. These sets contain 86,007 (CHO) and 75,309 (CHNO) compositionally isomeric structures, representing 706,568 CHO and 454,422 CHNO stereoisomers, that diversely and densely occupy this space.”

Damn, I was hoping for some non-carbon-based options :)