tropeoline 00

tropeoline 00

[trō′pē·ə·lən ′zir·ō ′zir·ō]
(organic chemistry)
NaSO3C6H4NNC6H4NHC6H5 An acid-base indicator with a pH range of 1.4-3.0, color change (from acid to base) red to yellow; used as a biological stain.