thymolphthalein

noun
thy·​mol·​phtha·​lein | \-ˈthal-ˌēn, -ˈthā-ˌlēn, -ˈthal-ē-ən \

Medical Definition of thymolphthalein 

: a crystalline compound C28H30O4 analogous to phenolphthalein and likewise used as an acid-base indicator

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