ascorbic acid shows nonuniform behavior : it accelerates the nitrosation of n-methylaniline between ph 1.00 and 1.95 , allows the nitrosation of diphenylamine and iminodiacetonitrile , but inhibits the nitrosation of secondary amines , such as dimethylamine , diethylamine , proline , hydroxyproline , n-methylaminoacetonitrile , n-methylaminopropionitrile , and sarcosine .
C0033382
proline
C0020388
hydroxyproline