117179-82-5
88424-91-3
128820-26-8
(3aR,4S,6aS)-perhydro-2-oxo-2H-cyclopentafuran-4-essigsaeure-methylester

807355-32-4
(1R,5S,6R)-6-methoxycarbonylmethyl-3-methoxy-2-oxabicyclo<3.3.0>octane

807355-33-5
(1R,5S,6R)-6-methoxycarbonylmethyl-3-hydroxy-2-oxabicyclo<3.3.0>octane