Subject
heterocyclic compound
111
organic compound
103
amine
26
hydroxyl group
16
nitrogen
14
oxygen
14
carbonyl compound
12
carboxylic acid
11
ketone
11
carboxyl group
9
carboxylate
8
carboxylic acid ester
8
carbonyl group
7
hydroxylamine
7
hydrazine
5
sulfonic acid
5
azo compound
4
organic chemistry
3
acid
2
carbonic acid
2
carbonic acid derivative
2
carboxylation
2
cyclic compound
2
nitroso compound
2
polyamine
2
aldehyde
1
formula
1
hydroxylation
1
nitrosamine
1
organic complex
1
triazine
1
triazole
1
uracil
1
uridine
1