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organic compounds
The crystal structure of (-)-formoterol, 2-hydroxy-5-(hydroxy-2-{[2-(p-methoxyphenyl)-1-methylethyl]amino}ethyl]- formanilide (+)-tartrate, C19H25N2O4+.C4H5O6-, has been determined in order to elucidate its configuration relative to that of (+)-tartrate. The result is consistent with the configuration proposed on the basis of the chemical correlation experiments.