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17O DNP NMR spectrum of 17O labeled phenol (3 mgs) in 60/30/10 (v/v) d8-glycerol/D2O/H2O and 40 mM trityl using direct polarization. a) Simulation using GIPAW calculated parameters, b) simulation of quadrupolar lineshape, c) experiment on-signal (~ 18 hours), d) experiment off-signal scaled by 100 and e) experiment off-signal (~ 144 hours).
