Table 3.

¹³C-NMR data of compounds 2 and 3 at 400 MHz in CDCl₃, δ in ppm.

	2	3
H-C(1)	158.2	158.4
H-C(2)	127.8	127.7
H-C(3)	188.6	188.7
H-C(4)	124.7	124.6
H-C(5)	170.9	171.2
H-C(6)	34.9	35.0
H-C(7)	33.3	34.8
H-C(8)	37.4	37.7
H-C(9)	61.1	61.3
H-C(10)	44.1	44.1
H-C(11)	211.4	213.3
H-C(12)	51.1	52.7
H-C(13)	52.3	52.8
H-C(14)	50.8	49.5
H-C(15)	24.1	24.5
H-C(16)	35.2	33.4
H-C(17)	89.1	85.0
H-C(18)	16.2	15.9
H-C(19)	19.3	19.3
H-C(20)	212.7	72.5
H-C(21)	67.8	65.0