InChI=1/C15H24BrClO/c1-12(2)11-5-6-14(4,18-11)15(12)8-7-13(3,17)10(16)9-15/h10-11H,5-9H2,1-4H3/t10-,11+,13-,14-,15-/m1/s Oxachamigrene rel-(1R,2R,3'R,4S,4'R)-3'-bromo-4'-chloro-1,3,3,4'-tetramethyl-7-oxaspiro[bicyclo[2.2.1]heptane-2,1'-cyclohexane] spiro[cyclohexane-1,2'-[7]oxabicyclo[2.2.1]heptane], 3-bromo-4-chloro-1',3',3',4-tetramethyl-, (1R,1'R,3R,4R,4'S)-