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Indole-3-pyruvic acid

Indole-3-carboxaldehyde

3-Indolepropionic acid

Indole-3-propanol

3-Indoleglyoxylic acid

Indole-2-carboxylic acid

Indole-6-carboxylic acid

3-Indoleformic acid

Indole-5-carboxylic acid

1H-Indole-7-carboxylic acid