. . "sizofiran" . . . "siguazodan" . . . "Siguazodan" . . . "Siguazodan" . . . . . . . . . . . . "1-Cyano-2-methyl-3-[4-(4-methyl-6-oxo-4,5-dihydro-1H-pyridazin-3-yl)phenyl]guanidine" . .