Humic Acid: A Green Acid Catalyzed by Acylation of Amine, Phenol, and Thiols Derivatives under Solvent-Free Conditions Shripad Patil*, Atnv Sairaju, Abhishek Saxena, Nowduri Aannapurna, 10.57647/j.ijc.2025.1503.36 Requires Subscription PDF Requires Subscription Supplementary information downloads: 265