INDICATOR COMPOUNDS, METHODS OF THEIR PREPARATION AND USE OF THOSE COMPOUNDS IN AN IRON ASSAY SYSTEM

摘要

ABSTRACTThe present invention is related to compounds ofthe general formula (I) (I)whereinR1 denotes hydrogen, halogen or C1-C4 alkyl,R2 denotes C1-C4 alkyl, aryl or heteroaryl, or asubstituted C1-C4 alkyl, aryl or heteroaryl and X de-notes hydrogen or Na and their preparation. The com-pounds can be used in an iron assay system.