Table 1.

¹H NMR (CDCl₃, 600 MHz) and ¹³C NMR (CDCl₃, 151 MHz) spectral data of compound 1

Position	δH (ppm)	δC(ppm)	HMBC
1	1.25 (21H, m)	14.3	C-2
2	4.15 (2H, q, J = 7.1 Hz)	60.1	C-1, C-3
3	–	174.3	–
4	2.31 (2H, t, J = 7.7 Hz))	35.0	C-3, C-5, C-6
5	1.60 (2H, m)	29.1	C-4
6	1.32 (21H, m)	24.9	C-5
7	2.79 (2H, m)	35.0	C-8
8	5.41 (1H, m)	130.0	C-6
9	5.41 (1H, m)	130.0	–
10	2.02 (2H, m)	31.9	C-11, C-9
11	1.35 (21H, m)	29.7	C-13
12	1.25 (21H, m)	2.8	C-11
13	0.85 (4H, t, J = 7.1 Hz))	14.3	C-11, C-12