Assertion: pyridine's derivative | /r/HasProperty | the 2-aminopyridines
Facets:
Source sentences:
text: (a) The 2-aminopyridine derivatives substituted at the third position; (b) the regioselective hydroxylation of 2-aminopyridines substituted at the fourth position (X = CH 3 , Cl, F); (c) the 2-aminopyridines substituted at the sixth position.