Several of the compounds labelled as TPs did not have any identified parent compounds. This may have several causes such as: degradation of the parent compound below detection limits, incorrect identification, or direct release of the compound labelled as a TP to the environment. One example of the latter is diclofenac (a common pharmaceutical observed at high intensity in wastewater), which was listed as a potential TP of aceclofenac. Excluding compounds that did not have identified parent compounds resulted in a total of 36 parent and TP pairs. Among these, the TPs were found to have a significantly lower octanol-water partitioning coefficient (logP), via the XlogP 40 values calculated in PubChem, compared to their parent compounds. (See Figure .) This in turn suggests a higher mobility of TPs compared to their parents. Some TPs were also associated with several parent compounds, e.g., terbuthylazine-2-hydroxy (see Table ), which is a TP of terbuthylazine and terbutryn. This may be an indication of a higher potential for accumulation of these TPs, especially for those with longer half-lives such as triazines. All tentatively identified TPs and their corresponding parents can be found in Table .