different between sulfonephthalein vs sulfonphthalein

English

sulfone +? phthalein

sulfonephthalein (plural sulfonephthaleins)

(organic chemistry) Any of many sulfonic acids derived from phthaleins, some of which are important acid-base indicators.

sulfonphthalein (plural sulfonphthaleins)

(chemistry) Any chemical compound, analogous to a phthalein, formed by the condensation of o-sulfobenzoic acid with a phenol.

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