Table 1 Compounds that were provided by Jack Elix, analyzed and did not result in detectable molecular ions.

From: An expanded database of high-resolution MS/MS spectra for lichen-derived natural products

1

3β-Acetoxyfern-9(11)-ene-12β-ol

21

16β, 22-Dihydroxyhopan-4α-oic acid [Leucotylic acid]

2

3β-Acetoxyfern-9(11)-ene-19β-ol

22

Hierridin

3

3β-Acetoxyhopane-1β,22-diol

23

Hopane-6α,22-diol [Zeorin]

4

6α-Acetoxyhopane-16β,22-diol

24

Hopane-7β,22-diol

5

16β-Acetoxyhopane-6α,22-diol

25

Hyperpicrolichenic acid

6

20α-Acetoxyhopane-6α,22-diol

26

Isohyperplanaic acid

7

6α-Acetoxyhopane-22-ol [Acetylzeorin, Lesdainin]

27

Jackinic acid

8

7β-Acetoxyhopan-22-ol [Peltidactylin]

28

Letrouitic acid

9

15α-Acetoxyhopane-22-ol [Dolichorrizin]

29

Lupeol

10

Acetyl-α-tocopherol [Tocopheryl acetate; vitamin E acetate]

30

3-O-Methyldiploicin [4-O-Methyldiploicin]

11

Anhydrofusarubin lactol

31

2′-O-Methylhiascic acid

12

Anhydrofusarubin lactol methyl ketal

32

4-O-Methyloxocryptochlorophaeic acid

13

Butlerin C

33

8-O-Methylthiomelin

14

Butlerin E

34

Micareic acid

15

Butlerin F

35

Scabrosin diacetate [4,4′-Diacetylscabrosin]

16

7-Chlorocitreorosein

36

Strepsilin

17

7-Chloro-1,6,8-trihydroxy-3-methyl-9-anthrone

37

Superlatolic acid [Prasinic acid]

18

α-Collatolic acid

38

Tenuiorin

19

Coneuplectin

39

Wrightiin

20

Decarboxyalectoronic acid

40

Crustinic acid

  1. This is possibly due to the compound not ionizing under ESI conditions, or the compound having broken down over years of storage.