Table 1.

Signal enhancement values (ɛ) of S1–S4 with 2 in D₂O.^[a]

Entry	S	2 (mol %)	Activation	ɛ(Ha)	ɛ(Hb)	ɛ(Hc)	ɛ(Hd)
1		10 %	48 h	24	14	26	–
2[b]		5 %	18 h	22	10	9	0
3[b]		5 %	18 h	9	7	6	0
4		10 %	18 h	42	28	30	8

[a] ¹H SABRE experiments at 80 G PTF, 1 mm 2, 10 mm S1–S4 in D₂O, 5.5 bar of 92 % p‐H₂, 48 h activation, 60 °C heating for 30 s, 5 s shaking, detection at 300 MHz, ɛ for free substrate. [b] 0.66 mm 2, 13.32 mm in D₂O, 18 h activation. Protons are labeled a, b, etc. in order of descending δ.