Bromo-acetic acid (1R,5S)-5-(4-methoxy-benzyloxy)-2-oxo-cyclohex-3-enyl ester

Acetic acid (2S,3S,4R,5S,6S)-4,5-diacetoxy-6-acetoxymethyl-2-((6S,7aR)-2-oxo-2,6,7,7a-tetrahydro-benzofuran-6-yloxy)-tetrahydro-pyran-3-yl ester

Acetic acid (2R,3R,4S,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-2-((6S,7aR)-2-oxo-2,6,7,7a-tetrahydro-benzofuran-6-yloxy)-tetrahydro-pyran-3-yl ester