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Long-term sediment toxicity studies have not been conducted for N-[3-(dimethoxymethylsilyl)-2-methylpropyl]ethylenediamine (CAS 023410-40-4). However, they are not required for Annex IX (Phase 2) substances under the REACH Regulation. Additionally, the substance hydrolyses rapidly and its hydrolysis product has a log Kow <3, therefore, partitioning to the sediment compartment is expected to be minimal.