TABLE 1.

¹H- and ¹³C-NMR data of terpentetriene and ent-clerod-3,13(16),14-triene

Group no.a, group	Terpentetriene		ent-clerod- 3,13(16), 14-triene
	C-13	H-1b	C-13
1, CH2	17.85	ca. 1.42 (m), ca. 1.64 (m)	18.3
2, CH2	26.85	ca. 1.97 (m), ca. 2.04 (m)	26.9
3, CH⩵	120.24	5.143 (br. s)	120.4
4, C⩵	144.55		144.5
5, C	38.31		38.2
6, CH2	30.20	ca. 1.435 (13, 13, 6), ca. 1.46 (m)	38.8
7, CH2	25.59	1.299 (14, 3, 3, 3), ca. 1.95 (13, 4, 4)	27.5
8, CH	35.16	ca. 1.65 (m)	38.3
9, C	37.69		38.8
10, CH	45.13	ca. 1.43 (m)	46.5
11, CH2	38.31	1.179 (13, 13, 5), ca. 1.63 (m)	37.5
12, CH2	24.57	2.136 (14, 14, 5), 2.185 (14, 14, 5)	24.7
13, C⩵	147.75		147.6
14, CH⩵	139.24	6.372 (18, 11)	139.0
15, CH2⩵	113.02	5.242 (18, br), 5.043 (11, br)	112.9
16, CH2⩵	115.24	4.99 (s)	115.5
17, CH3	14.88	0.96 (7)	16.1
18, CH3	20.63	1.051 (s)	20.0
19, CH3	18.01	1.582 (br. s)	16.0
20, CH3	20.38	0.968 (s)	18.4

^aThe numbering corresponds to that in Fig. 3 and 4. 

^bValues in parentheses represent ¹H-¹H coupling constants in hertz.