3-(2-Chloro-ethyl)-5-{3-(2-chloro-ethyl)-5-[4-(2-methoxycarbonyl-ethyl)-3,5-dimethyl-pyrrol-(2Z)-ylidenemethyl]-4-methyl-1H-pyrrol-2-ylmethyl}-4-methyl-1H-pyrrole-2-carboxylic acid tert-butyl ester; hydrobromide