Bis(2,2,6,6-tetramethyl-4-piperidyl) sebacate (abbreviated BTMPS) is a hindered amine light stabilizer used to protect plastics and coatings such as paint from oxidation caused by weathering.

Like most compounds of this class, it's active form is an aminoxyl radical.

In 2024 it was detected as an adulterant in illicitly sold fentanyl in the United States.

[1][2] It is produced by the esterification of sebacic acid and tetramethylpiperidinol (or its oxidised form 4-Hydroxy-TEMPO).

[7] Similar to early calcium channel blockers, it can precipitate adrenergic release.