isuretine

from The Century Dictionary.

• noun A colorless compound, HON:CHNH₂, prepared by the action of hydroxylamine and hydrocyanic acid. It forms rhombic columnar crystals, melting and partly decomposing at 104–105°C. Also called methenylamidoxime.

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

• noun chemistry A synthetic nitrogenous base, isomeric with urea.