1H, 15N TROSY-HSQC (imino) spectrum of 3_SL3base: 230 μM of U-15N labeled RNA (25 mM potassium phosphate buffer at pH 6.2, 50 mM KCl, 5% D2O) measured at 298 K on a 599 MHz Spectrometer. Chemical shift assignment of Imino region is depicted and deposited in the BMRB doi:10.13018/BMR50350