上游原料
3,6-difluoropyrazine-2-carbonitrile6-fluoro-3-hydroxypyrazine-2-carbonitrile compound with dicyclohexylaminediphenylmethanimineMethyl 3-amino-6-bromo-2-pyrazinecarboxylatemethyl 6-bromo-3-methoxy-2-pyrazinecarboxylatemethyl 6-amino-3-methoxy-2-pyrazinecarboxylate6-amino-3-methoxy-2-pyrazinecarboxamide6-fluoro-3-methoxy-2-pyrazinecarboxamide
