Estimation of Salbutamol, Bromhexine, Guaifenesin, Methyl hydroxybenzoate and Propyl hydroxybenzoate in Multicomponent Cough Expectorant syrup by HPLC. International Journal of Environmental Sciences, [S. l.], p. 816–848, 2025. DOI: 10.64252/pzavtm72. Disponível em: https://theaspd.com/index.php/ijes/article/view/2140.. Acesso em: 18 sep. 2025.