Table 1 The detected diamondoid compounds in this study.

1

Adamantane

136 → 93

A

2

1-Methyladamantane

150 → 135

1-MA

3

2-Methyladamantane

150 → 135

2-MA

4

1-Ethyladamantane

164 → 135

1-EA

5

2-Ethyladamantane

164 → 135

2-EA

6

1,3-Dimethyladamantane

164 → 149

1,3-DMA

7

1,4-Dimethyladamantane (cis)

164 → 149

1,4-DMA (cis)

8

1,4-Dimethyladamantane (trans)

164 → 149

1,4-DMA (trans)

9

1,2-Dimethyladamantane

164 → 149

1,2-DMA

10

2,6- + 2,4-Dimethyladamantane

164 → 149

2,6- + 2,4-DMA

11

1-Ethyl,3-methyladamantane

178 → 149

1-E,3-MA

12

1,3,5-Trimethyladamantane

178 → 163

1,3,5-TMA

13

1,3,6-Trimethyladamantane

178 → 163

1,3,6-TMA

14

1,3,4-Trimethyladamantane (cis)

178 → 163

1,3,4-TMA (cis)

15

1,3,4-Trimethyladamantane (trans)

178 → 163

1,3,4-TMA (trans)

16

1,2,3-Trimethyladamantane

178 → 163

1,2,3-TMA

17

1-Ethyl,3,5-dimethyladamantane

192 → 163

1-E,3,5-DMA

18

1,3,5,7-Tetramethyladamantane

192 → 177

1,3,5,7-TeMA

19

1,2,5,7-Tetramethyladamantane

192 → 177

1,2,5,7-TeMA

20

1,3,5,6-Tetramethyladamantane

192 → 177

1,3,5,6-TeMA

21

1,2,3,5-Tetramethyladamantane

192 → 177

1,2,3,5-TeMA

22

1-Ethyl-3,5,7-trimethyladamantane

192 → 177

1-E-3,5,7-TMA

I.S.-1

n-Dodecane-d26

196 → 82

n-C12-d26

23

Diamantane

188 → 131

D

24

4-Methyldiamantane

202 → 187

4-MD

25

1-Methyldiamantane

202 → 187

1-MD

26

3-Methyldiamantane

202 → 187

3-MD

27

4,9-Dimethyldiamantane

216 → 201

4,9-DMD

28

1,4-Dimethyldiamantanet

2,4-Diamethyldiamantane

216 → 201

1,4-DMD + 2,4-DMD

29

4,8-Dimethyldiamantane

216 → 201

4,8-DMD

30

3,4-Dimethyldiamantane

216 → 201

3,4-DMD

31

1,4,9-Trimethyldiamantane

230 → 215

1,4,9-TMD

32

3,4,9-Trimethyldiamantane

230 → 215

3,4,9-TMD

I.S.-2

n-Hexadecane-d34

260 → 82

n-C16-d34