27258-01-1 3-Methoxy-4-n-butyl-1,2-diphenyl-5-pyrazolone 3-Pyrazolin-5-one, 4-butyl-1,2-diphenyl-3-methoxy- 3H-Pyrazol-3-one, 4-butyl-1,2-dihydro-5-methoxy-1,2-diphenyl- (9CI) 4-Butyl-1,2-diphenyl-3-methoxy-3-pyrazolin-5-one 5-25-01-00044 (Beilstein Handbook Reference) BRN 0298333