Table 1 Tentative assignment of chemical constituents of 85% MeOH extract of C. arvensis by LC-ESI-MS

Phenolic acids

Quinic acid

12.02

192

191

173, 97

0.02

Benzoyl-Caffeoylquinic acid

16.16

476

475

353, 191, 135

0.11

5-O-Caffeoylquinic acid

18.83

354

353

191 (100%), 179 (63%), 135

0.97

4-O-Caffeoylquinic acid

19.10

354

353

191 (40%), 179 (66%), 135

0.03

3-O-Caffeoylquinic acid dimer

20.70

708

707

353, 191 (100%), 135

0.15

5-O-Caffeoylquinic acid dehydrodimer

21.23

706

705

513, 339, 191

0.27

5-O-Caffeoylquinic acid dimer

23.50

708

707

353, 191 (100%), 179, 135

29.42

5-O-Caffeoylquinic acid dimer isomer

25.23

708

707

353, 191 (100%), 179, 135

0.79

4-O-Caffeoylquinic acid dimer

26.04

708

707

191(40%), 179, 135 (100%)

0.19

Caffeic acid

27.10

180

179

161, 135

0.23

Coumaroylquinic acid

28.30

338

337

191, 173, 93, 85

0.41

Feruluylquinic acid

29.77

368

367

191, 173

1.24

4,5-di-O-caffeoylquinic acid

38.72

516

515

353, 191, 179, 135

5.81

Ferulic acid

40.86

194

193

161, 133

7.74

3, 4-di-O-caffeoylquinic acid

41.67

516

515

353, 191, 179, 135

6.91

Caffeic acid derivatives

50.47

424

423

285, 179, 161

0.55

Flavonoids

Quercetin-O-pentosyl-dihexosides

33.25

742

741

609, 301, 179

2.64

Apigenin-C-hexoside-O-pentoside

34.18

564

563

443, 413, 293

0.31

Quercetin-3-O-rutionside (Rutin)

36.58

610

609

463, 301, 179, 151

33.63

Quercetin-3-O-hexoside

37.39

464

463

301, 179, 151

1.73

Quercetin-7-O-[3-hydroxy-3-methylglutaroyl] hexoside

39.65

308

607

505, 463, 301

1.10

Kaempferol-3-O-rutinoside

40.19

594

593

285

2.20

Glycolipids

Trihydroxy-10,15-octadecadienoic acid derivative

58.61

328

327

291, 229, 211, 171

2.19

Sesquiterpenes

Magastigmane

glycoside derivative

26.57

388

387

161

0.41

Unknown compounds

Unknown

28.84

622

621

511, 337, 191

0.09

Unknown

44.59

432

431

313, 191, 179, 149 (100%), 135

0.85

Total area % of identified compounds

99.99