{6-Amino-4-[2-(4-methoxy-phenyl)-2-oxo-ethylamino]-5-nitro-pyridin-2-yl}-carbamic acid ethyl ester
ethyl 5-amino-1,2-dihydro-3-(4-methoxyphenyl)pyrido[3,4-b]pyrazin-7-ylcarbamate
{6-Amino-4-[2-[(Z)-hydroxyimino]-2-(4-methoxy-phenyl)-ethylamino]-5-nitro-pyridin-2-yl}-carbamic acid ethyl ester