1,3-Diphenyl-.DELTA.2-pyrazoline 1,3-Diphenyl-2-pyrazoline 1,3-Diphenylpyrazoline 1H-Pyrazole, 4,5-dihydro-1,3-diphenyl- 2-Pyrazoline, 1,3-diphenyl- 2538-52-5 NSC186211