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Phthalein, thal′e-in, n. one of a very important class of dye-yielding materials formed by the union of phenols with the anhydride of phthalic acid.—adj.

The city is also a booming center of the chemical industry, prolific source of exotic effluents like phthalic anhydride and chlorinated phenolic compounds, which make the eyes water and smell like the medicines children swallow while holding their noses.

Dr. Heinz M. Wuest, 76, supposedly retired but still active in his laboratory as a consultant to the Sloan-Kettering Institute for Cancer Research, pointed out that the thalidomide molecule contains both a form of glutamic acid and a form of phthalic acid.

But, said Wuest, in thalidomide the structural combination of glutamic and phthalic acids is most unusual.

Phthalic Acid and the Phthaleïns, 145.