Pyrazine derivatives R 0550Synthesis and Antimicrobial Activity of 2-Substituted Benzyl Hydrazino-3-methyl Quinoxalines. -Compounds (VIa) and (VId) are highly active against Bacillus subtilis and active against Pseudomonas. -(VYAS, D. A.; CHAUHAN, N. A.; PARIKH*, A. R.; J. Indian Chem. Soc. 82 (2005) 11, 972-974; Dep. Chem., Saurashtra Univ., Rajkot 360 005, India; Eng.) -C. Oppel 22-167