2-Oxobenzopyran-3-carboxylic acid 2H-1-Benzopyran-3-carboxylic acid, 2-oxo- 3-Carboxycoumarin 531-81-7 Coumarin-3-carboxylic acid G 1 G 1 (The rodenticide) Malonic acid, salicylidene-, .delta.-lactone NSC44926 WLN: T66 BOVJ DVQ