Ames test benzimidazole nonhuman unclassified drug 2 nitrofluorene 4 (5,6 dimethyl 1h benzo[d]imidazol 2 yl) n' (2 hydro xybenzylidene)benzohydrazide 4 (5,6 dimethyl 1h benzo[d]imidazol 2 yl) n' (3 hydroxybenzylidene)benzohydrazide Activation, Metabolic Article Benzimidazole Benzimidazoles Drug Resistance, Microbial Genotype Melastoma malabathricum Melastoma malabathricum extract Melastomataceae Mutagens Salmonella enterica serovar Typhimurium Salmonella typhimurium Structure-Activity Relationship Structure-activity relationship (SAR) abdominal cramp acetylsalicylic acid acne anemia animal tissue antibacterial activity antibiotic agent antibiotic resistance anticoagulant agent