Figure 5
From: Linguistic measures of chemical diversity and the “keywords” of molecular collections
Distributions of MCS chemical word lengths and examples of such words. (a) Distribution of word lengths, measured by the number of non-hydrogen atoms, for molecules randomly chosen from Reaxys (orange), for drugs (blue), and for natural products (green). (b) Examples of words from the distribution of (b) drugs and (c) natural products. As in Fig. 1, the structures shown are molecular fragments not actual molecules with correct valences (e.g., if oxygen is monovalent, it can be attached to H, alkyl, aryl, etc.).
