(5S,6R,7R,8S)-6-<7,8-dihydro-8-hydroxy-7-(methoxymethoxy)styryl>-5-(methoxymethoxy)-5,6-dihydro-2H-pyran-2-one

goniopypyrone-5,7-O-dimethoxymethyl ether

8-epi-goniopypyrone-5,7-O-dimethoxymethyl ether

(5S,6R)-6-<(1'R)-2'-(tert-butyldimethylsiloxy)-1'-(methoxymethoxy)ethyl>-5-(methoxymethoxy)-5,6-dihydro-2H-pyran-2-one

(5S,6R,7R,8S)-6-<8-acetoxy-7,8-dihydro-7-(methoxymethoxy)styryl>-5-(methoxymethoxy)-5,6-dihydro-2H-pyran-2-one