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From Biology-Online Dictionary | Biology-Online Dictionary
(Science: chemical) 4,4'-(3h-2,1-benzoxathiol-3-ylidene)bisphenol s,s-dioxide. Red dye, ph indicator, and diagnostic aid for determination of renal function. It is used also for studies of the sexual gastrointestinal and other systems.
Pharmacological action: indicators and reagents, phthalein dyes.
chemical name: phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, S,S-dioxide