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2,2-bis[[(1-oxoisononyl)oxy]methyl]-1,3-propanediyl diisononanoate(CAS 93803-89-5) is determined to be not readily biodegradable (6% after 60 d) according to the OECD criteria in one confirmatory GLP-Guideline study. The substance is thus expected to be not degradable by microorganisms in both the aquatic and terrestrial environments as well. Further simulation tests investigating the biodegradation in water and sediment or soil according to Regulation (EC) No. 1907/2006, column 2, - 9.2.14, were not proposed since the substance is likely to persist.