Anatabine is obtained by reacting benzophenoneimine with 3-aminomethyl pyridine to form benzylhydrylidene-pyridin-3-yl-methyl-amine. DNA sequences and constructs for expression of engineered beta-ketoacyl-ACP synthases, as well as the novel beta-ketoacyl-ACP synthases produced therefrom are also provided. A center conductor of the coaxial cable is connected to a first radiating element in terms of alternating current at least through capacitive coupling, and an outer conductor of the coaxial cable is connected to a second radiating element in terms of alternating current at least through capacitive coupling. Then, it checksdeletes a straight line according to a distribution of black pixels around the straight line, and recognizes the remaining straight lines as ruled line candidates.