Carbon-13, Hyperpolarization, NMR Spectroscopy, Parahydrogen, RASER Spontaneous RASER signal emissions were detected using a 1.4 T NMR spectrometer equipped with a standard radiofrequency detection coil for over three minutes. Keywords: Carbon-13; Hyperpolarization; NMR Spectroscopy; Parahydrogen; RASER EN Carbon-13 Hyperpolarization NMR Spectroscopy Parahydrogen RASER 1 1 1 01/27/23 20230126 NES 230126 B Carbon-13 radiofrequency amplification b by stimulated emission of radiation (C-13 RASER) is demonstrated on a bolus of liquid hyperpolarized ethyl [1- SP 13 sp C]acetate, as reported by Thomas Theis, Eduard Y. Chekmenev et al. in their Communication (e202215678).