Table 1 Qualitative and quantitative summary (in ppb) of uracil and other N-heterocyclic molecules identified in the Ryugu samples (A0106, C0107) and Orgueil meteorite

Uracil

11 ± 6^a

32 ± 9

92

140

73

15

37

4

Imidazole-2-carboxylic acid

6

9 ± 1

12

12

–

19

14

4

Imidazole-4-carboxylic acid

17 ± 3

19 ± 3

136

218

–

90

99

19

Nicotinic acid

49 ± 1

99 ± 4

602

715

–

91

626

108

Picolinic acid

n.d.²

n.d.

n.d.

n.d.

–

–

–

–

Isonicotinic acid

49 ± 20

62 ± 23

237

203

–

53

307

118

Nicotinamide

n.d.

n.d.

214

n.d.

–

10

–

–

Isonicotinamide

n.d.

n.d.

38

n.d.

–

3

–

–

Picolinamide

n.d.

n.d.

n.d.

n.d.

–

1

–

–