前期1kg，后期50-100kg，项目稳定。

methyl 5-(2,4-difluorophenyl)-4-methoxy-1H-pyrrole-3-carboxylate
Chemical Formula: C13H11F2NO3
Molecular Weight: 267.2318
m/z: 267.0707 (100.0%), 268.0741 (14.1%)
Elemental Analysis: C, 58.43; H, 4.15; F, 14.22; N, 5.24; O, 17.96