The cyclic structure in the spin trap is often a five-membered ring that includes the nitrone functional group. The cyclic structure helps to stabilize the radical adduct formed when the spin trap reacts with a free radical.
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3-Pyrrolidinecarboxylic acid, 2,4,4-trimethyl-2-phenyl-, ethyl ester
(S)-1-(methoxymethyl)-3-phenyl-3,4-dihydroquinoxalin-2(1H)-one
