Naturally, given their greater presence in the CSD, motifs involving a N-H or O-H hydrogen bonded to N or O form the majority of the motifs in our dataset. This could also be a reflection of the fact that hydrogen bonds involving oxygen and nitrogen tend to be 'stronger' and are more stabilizing due to the greater polarizing effect exerted by the period 2 elements, and as such the formation of these hydrogen bonds is more favourable. It is also encouraging to observe that non-canonical hydrogen bonds involving the heavier elements, like sulphur and chlorine, are not completely absent from our dataset, although they are relative scarce. Ultimately, the analysis of the atomic environments and hydrogen bonding motifs indicates that our reference dataset has a sufficiently broad chemical profile for use in parameter estimation of transferable force-fields. Areas in the dataset where information appears sparse can mostly be attributed to the scarcity of relevant structures in the CSD.