1-Hydroxy-6-(1-hydroxy-1-methylethyl)-3-isobutyl-2(1H)-pyrazinone 15272-17-0 2(1H)-Pyrazinone, 1-hydroxy-6-(1-hydroxy-1-methylethyl)-3-(2-methylpropyl)- (9CI) 2(1H)-Pyrazinone, 1-hydroxy-6-(1-hydroxy-1-methylethyl)-3-isobutyl- 5-25-01-00204 (Beilstein Handbook Reference) BRN 0747158 Mutaaspergillic acid