2h-pyran-2-carboxylic

(2S,3S,4S,5S,6R)-6-[(tert-butylamino)methyl]-5-(2-cyclopentyl-4-hydroxyphenoxy)-6-ethoxy-3,4,5-trihydroxytetrahydro-2H-pyran-2-carboxylic acid

2H-Pyran-2-carboxylic acid, 3,6-dihydro-4,5-dimethyl-, butyl ester