Synthesis, Acetylcholinesterase, Butyrylcholinesterase and Tyrosinase Inhibition, and Antioxidant Studies of 2-[2-(substituted-benzyl)-4(7)-phenyl-1H-benzimidazol-1-yl]acetohydrazides and methyl 2-[2-(substituted-benzyl)-4(7)-phenyl-1H-benzimidazol-1-yl]acetates.