24582-90-9 2H-Pyran-4-acetic acid, 3-formyl-3,4-dihydro-5-(methoxycarbonyl)-2-methyl-, (2S,3S,4S)- 2H-Pyran-4-acetic acid, 3-formyl-3,4-dihydro-5-(methoxycarbonyl)-2-methyl-, (2S-(2alpha,3alpha,4beta))- 3-Formyl-3,4-dihydro-5-(methoxycarbonyl)-2-methyl-2H-pyran-4-acetic acid 34422-12-3 51050-95-4 Elenolic acid Glutaric acid, 3-(1-formylpropenyl)-2-(hydroxymethylene)-, 1-methyl ester