德拉沙星中间体2
Ethyl 1-(6-amino-3,5-difluoropyridin-2-yl)-6-fluoro-7-[3-(isobutyryloxy)azetidin-1-yl]-4-oxo-1,4-dihydroquinoline-3-carboxylate ·
Ethyl 1-(6-amino-3,5-difluoropyridin-2-yl)-6-fluoro-7-[3-(isobutyryloxy)azetidin-1-yl]-4-oxo-1,4-dihydroquinoline-3-carboxylate ·