MS/MS spectra of ss12 by (a) UVPD of 4- (one UV pulse, 5mJ), (b) EPD of 3-• (one UV pulse, 5mJ; then 28% normalized collision energy, 30 ms), and (c) CID 4- (20% normalized collision energy, 30 ms), and (d) IRMPD 4- (5.0 ms irradiation, 10 W). Precursor ions are noted with a star.