Subject
heterocyclic compound
88
organic compound
59
amine
19
carbonyl compound
12
carboxylic acid
11
hydroxyl group
11
ketone
11
nitrogen
10
oxygen
10
carboxyl group
9
carboxylate
8
carboxylic acid ester
8
hydroxylamine
5
hydrazine
4
sulfonic acid
4
azo compound
3
carbonyl group
3
acid
2
carbonic acid
2
carbonic acid derivative
2
carboxylation
2
cyclic compound
2
organic chemistry
2
polyamine
2
aldehyde
1
hydroxylation
1
nitrosamine
1
nitroso compound
1
organic complex
1
triazole
1
uracil
1
uridine
1