| http://www.w3.org/ns/prov#value | - is present in said hindered amine, at least one of R1, R2, R3, and R4 is an alkyl group or an electron donating group; and if R3, R4 and one of R1 or R2 is hydrogen, the other of R1 or R2 is an alkyl group having at least 2 carbon atoms. 3.
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