(+)-(1R,2S,3S,4S)-dimethylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylate

6c-oxo-(6at,10at)-5,6,6a,7,8,9,10,10a-octahydro-6λ4-7r,10c-methano-benzo[e]naphtho[1,2-c][1,2]thiazine-8c,9t-dicarboxylic acid dimethyl ester

5c-oxo-(4at,10bt)-1,2,3,4,4a,5,6,10b-octahydro-5λ4-1r,4c-methano-dibenzo[c,e][1,2]thiazine-2r',3t'-dicarboxylic acid dimethyl ester