(R)-4-Hydroxy-5-methylfuran-2(5H)-one 2(5H)-FURANONE, 4-HYDROXY-5-METHYL- 2(5H)-Furanone, 4-hydroxy-5-methyl-, (R)- (9CI) 22885-98-9 EINECS 245-294-3 Methyltetronic acid alpha-Methyl tetronic acid