6-methyl-2-oxo-3-[(2-phenylethyl)amino]-1(2H)-pyrazineacetic acid ethyl ester

(3,5-dichloro-6-methyl-2-oxo-2H-pyrazin-1-yl)acetic acid benzyl ester

2-苯乙胺

3,5-dichloro-6-methyl-1-methylenecarboxypyrazinone

3-(2-phenethylamino)-5-chloro-6-methyl-1-methylenecarboxypyrazinone