Ara T, Zaman Khan K. Reaction of Dimethyl Sulphoxide and Trifluoroacetic Anhydride with 3-Nitro-4-hydroxycoumarin. ajc [Internet]. 2010 Mar. 30 [cited 2024 Nov. 25];22(5):3397-403. Available from: https://asianpubs.org/index.php/ajchem/article/view/11561