Another example of how substances can be regulated based on their precursors are the aromatic amines registered under REACH some of which can also be found on PMT/vPvM suspect lists, such as 4,4'-methylenedianiline, 4,4'-oxydianiline, 4-chloroaniline, 3,3'-dichlorobenzidine, 4,4'methylenebis(2-chloroaniline), 4,4'-methylenedianiline, and 2-methoxy-5-methylaniline . However, there are several other aromatic amines that have multiple known precursors listed in the PubChem transformations library (e.g. 4-aminophenol and aniline) that are also listed as PMT by the UBAPMT suspect list. As such, regulating aromatic amines and precursor substances as a group based on PMT/vPvM substances warrants further investigation and consideration.