2-Dimethylaminomethyl-2-((3aS,4R,7aR)-6-methoxycarbonyl-2-oxo-3a,4,5,7a-tetrahydro-benzo[1,3]dioxol-4-yloxy)-malonic acid dimethyl ester

compound Z1

methyl <1(R)-(1α,5α,6α)>-5-<<1-(methoxycarbonyl)ethenyl>oxy>-8-oxo-7,9-dioxabicyclo<4.3.0>non-2-ene-3-carboxylate

methyl <1(R)-(1α,5α,6α)>-5--8-oxo-7,9-dioxabicyclo<4.3.0>non-2-ene-3-carboxylate

2-Chloro-2-((3aS,4R,7aR)-6-methoxycarbonyl-2-oxo-3a,4,5,7a-tetrahydro-benzo[1,3]dioxol-4-yloxy)-malonic acid dimethyl ester