(-)-Methyl 2-methylbutyrate (-)-Methyl alpha-methylbutyrate 55449-44-0 Butanoic acid, 2-methyl-, methyl ester, (2R)- (9CI) Butanoic acid, 2-methyl-, methyl ester, (R)- Methyl (R)-2-methylbutanoate butanoic acid, 2-methyl-, methyl ester, (2R)-