Chemical shift δ (ppm)

L-Arginine maleate dihydrate

L-Arginine

Maleic acid

Group identification

174.27

175.38

-

-COOH-

170.81

-

166.53

-COOH-

156.71

157.85

-

-NH=C─NH₂-

134.35

-

129.99

-CH-

54.24

55.45

-

-CH─NH₂-

40.45

41.64

-

-CH₂-

27.49

28.77

-

-CH₂-

23.84

25.03

-

-CH₂-