23037-20-9 4-Hydroxy-2,2,6,6-tetramethylpiperidine-4-carbonitrile 4-Piperdinecarbonitrile, 4-hydroxy-2,2,6,6-tetramethyl- 4-Piperidinecarbonitrile, 4-hydroxy-2,2,6,6-tetramethyl- EINECS 245-391-0