Table 1.

¹H-NMR Chemical Shifts of 9a, S- and R-Mosher Esters (Δδ = δS − δR)^a

	1H NMR chemical shift (ppm)
	C3 of 9a is S			C23 of 9a is R
	2Hα	2Hβ	4-CH2	22-CH2	24H′	24H″
9a	1.84	1.51	2.26	1.68	1.43	1.10
19a (S-ester)	1.91	1.61	2.46	1.92	1.63	1.48
19b (R-ester)	1.98	1.73	2.36	1.96	1.58	1.44
Δδ	−0.07	−0.08	0.10	−0.04	0.05	0.04

^aThe C3-configuration was used as an internal standard. Chemical shifts of Mosher esters were assigned from ¹H–³H COSY spectra.