Disclosed are A1 adenosine receptor antagonists having the general formulaThe compounds are useful for treating various disease states, in particular disease states for which diuretic treatment is appropriate. The data processor may be arranged to receive signals representative of the time codes of the recorded audiovideo signals, and the metadata may include time code data representative of the in and out points of a take of the audiovideo signals generated by the data processor. A set of terms that frequently occur in the titles of the documents may be iteratively expanded and overlapping phrases may be merged until there may be no more terms that occur in the titles with a frequency that exceeds a predefined threshold. A smoothed power estimate and a noise estimate are calculated.