(1S,6R,8R,9R)-8-Iodo-11-oxo-10-oxa-tricyclo[7.2.1.01,6]dodecane-6-carboxylic acid methyl ester

12-Oxa-tricyclo[4.4.3.01,6]tridec-4-ene-3,11,13-trione

12-Oxa-tricyclo[4.4.3.01,6]tridec-4-ene-3,13-dione