The given compound is commonly used as an indicator in acid-base titrations. Identify the compound. 
Definitions:
Median
The middle value in a sorted list of numbers, effectively dividing the dataset into two equal halves.
IQR
Stands for Interquartile Range, a measure of variability in statistics that describes the middle 50% of values when ordered from least to greatest.
Range
Range is a measure of the spread or dispersion within a data set, calculated as the difference between the highest and lowest values in the set.
Median
The middle value in a data set when the values are arranged in ascending or descending order, or the average of the two middle numbers if the data set has an even number of observations.
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