1-phenyl-3-pyrazolidinone

1-phenyl-3-pyrazolidinone

[¦wən ¦fen·əl ¦thrē ‚pī·rə·zə′lid·ən‚ōn]
(organic chemistry)
C9H10N2O A crystalline compound soluble in dilute aqueous solutions of acids and alkalies; melting point is 121°C; used as a high-contrast photographic developer.