in the mixture of aur and the spin-trap , phenyl n-tert-butyl nitron ( pbn ) , a definite signal was observed in the presence of ethanol or methanol , and addition of dithiothreitol increased the signal intensity about 5-fold , giving a hyperfine coupling constant of an = 15.9 g and a beta h = 3.6 g .
C0001962
ethanol
C0001963
methanol