154368-87-3

2H,5H-Pyrano[4,3-b]pyran-8-carboxylic acid,3,4-dihydro-2-[4-hydroxy-5-(methoxycarbonyl)-6-methyl-2-oxo-2H-pyran-3-yl]-4,7-dimethyl-5-oxo-, methyl ester, cis-