Fig. 3From: Synthesis, density functional theory study and in vitro antimicrobial evaluation of new benzimidazole Mannich basesThe structure formulas and the DFT optimized structures of benzimidazole B and Mannich bases M-1–M-5 (black-C; grey-H; red-O; blue-N). For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article. aFrom Ref. [6]Back to article page