In November 2023, ChemSec updated the SIN List. The update adds the following substances that were included in the Candidate List in June 2023:

1. Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide

2. Bis(4-chlorophenyl) sulphone

In addition, the update adds the following substances related to substances already on the SIN List:

1. Dibenzo[b,def]chrysene

2. Dibenzo[def,p]chrysene