EICs and LC/MS2 of D0/D9-POBN adducts of •C20H35O5. (A and B) EIC of m/z 550 from the POBN spin-trapping experiment and EIC of m/z 559 from the D9-POBN spin-trapping experiment, respectively; (C and D) LC/MS2 of m/z 550 from the POBN spin-trapping experiment and LC/MS2 of m/z 559 from the D9-POBN spin-trapping experiment, respectively. Note that a or a’, b or b’, c or c’, and d or d’ ions are typical of fragmentation of POBN or D9-POBN adducts in MS.