Table 2. Details of spin system and associated experimental parameters for the substrates 1, 2 and 3 .

Substrate	1	2	3
J-coupling constant (Hz)	4.90	8.05	2.50
Chemical shift difference (Hz)	457.0	298.0	34.4
d 2 (ms)	51.02	31.05	100.0
d 3 (ms)	52.11	32.73	114.53
d 4 (ms)	0.547	0.839	7.26