(1S,4S,5R,6R,8R)-6-(hydroxymethyl)-8-isopropyl-8-methoxy-1-methyl-4-[(pivaloyloxy)methyl]-3,7-dioxabicyclo[3.3.0]octan-2-one

(1S,4S,5R,6R,8R)-6-(acetoxymethyl)-8-hydroxy-8-isopropyl-1-methyl-4-((pivaloyloxy)methyl)-3,7-dioxabicyclo(3.3.0)octan-2-one

(1S,4S,5R,6R,8R)-6-(acetoxymethyl)-8-isopropyl-8-methoxy-1-methyl-4-((pivaloyloxy)methyl)-3,7-dioxabicyclo(3.3.0)octan-2-one

2,2-Dimethyl-propionic acid (1S,3aS,4R,6R,6aR)-4-isopropyl-4-methoxy-3a-methyl-3-oxo-6-trifluoromethanesulfonyloxymethyl-tetrahydro-furo[3,4-c]furan-1-ylmethyl ester

(3S,3aR,4S,6R,6aS)-4-(((R)-5-ethyl-2-methyl-3-oxo-2,3-dihydrofuran-2-yl)methyl)-3-(hydroxymethyl)-6-isopropyl-6-methoxy-6a-methyltetrahydrofuro[3,4-c]furan-1(3H)-one