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Table 15 The percentage \(\rho _{\text {2bt}}(\delta )\) of the number of acyclic chemical graphs in \(\text {DB}^{(\le 50)}\) such that the degree of the root of the 2-branch-tree is \(\delta \in [1,4]\) to the number of all acyclic chemical graphs in \(\text {DB}^{(\le 50)}\)

From: A novel method for inference of acyclic chemical compounds with bounded branch-height based on artificial neural networks and integer programming

\(\rho _{\text {2bt}}(1)\) \(\rho _{\text {2bt}}(2)\) \(\rho _{\text {2bt}}(3)\) \(\rho _{\text {2bt}}(4)\)
\(6.39\%\) \( 83.58\%\) \( 9.30\%\) \( 0.73\%\)