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COASOL 290 PLUS is a reaction mass of dibutyl glutarate and dibutyl adipate, while COASOL is a reaction mass of the very similar isomers diisobutyl glutarate, diisobutyl succinate, and diisobutyl adipate. The results from a supporting study with COASOL are applied to COASOL 290 PLUS (read-across). The available biodegradation studies demonstrate that COASOL 290 PLUS was readily biodegradable in an OECD 301D Closed Bottle Test, whereas COASOL showed extensive biodegradation in an OECD 306 Biodegradability in Seawater Test. As such no further testing of biodegradation is necessary.