SEARCH Articles Figures Tables 3- Hydroxy-2-methyl-butyric acid Butyrate/butyric acid Butyric acid Butyric acid methyl ester Butyric acid, 3-Amino-3-methyl Butyric acid, 3-hydroxyenolates methyl ester Methyl butyrate Phenyl C61-butyric acid methyl ester Phenyl-C61-butyric acid methyl ester PCBM) Phenyl-C6i-butyric acid methyl ester Phenyl-C6i-butyric acid methyl ester PCBM) Phenyl-Cgi-butyric acid methyl ester (PCBM