Indole-2-carboxylic acid-13C is the 13C-labeled Indole-2-carboxylic acid. Indole-2-carboxylic acid is a strong inhibitor of lipid peroxidation. Indole-2-carboxylic acid (I2CA) specifically and competitively inhibits the potentiation by glycine of NMDA-gated current[1][2].