5-Methyl-1H-pyrrole-2-carboxylic acid (3R,4S,5R,6R)-6-[4-(2-bromo-ethoxy)-3-chloro-8-methyl-2-oxo-2H-chromen-7-yloxy]-5-hydroxy-3-methoxy-2,2-dimethyl-tetrahydro-pyran-4-yl ester