phthalimide

from The Century Dictionary.

• noun A crystalline substance, C₈H₅NO₂, made by the action of dry ammonia gas on heated phthalic anhydrid, and in other ways. It melts at 233.5° C., and acts as a monobasic acid toward alkalis.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) An imido derivative of phthalic acid, obtained as a white crystalline substance, C6H4.(CO)2NH, which has itself (like succinimide) acid properties, and forms a series of salts. Cf. Imido acid, under imido.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun organic chemistry The imide of phthalic acid; it is used in the manufacture of some plastics