6-exo-methyl-4-oxa-7,8-benzotricyclo<4.3.0.02,9>non-7-ene-3,5-dione

2-exo-methyl-3,4-benzobicyclo<3.1.0>hex-3-ene-2-endo,6-endo-dicarboxylic acid

dimethyl 3,4-benzobicyclo<3.1.0>hex-3-ene-2-exo,6-endo-dicarboxylate

dimethyl 2-exo-methyl-3,4-benzobicyclo<3.1.0>hex-3-ene-2-endo,6-endo-dicarboxylate

(1S,1aR,6S,6aS)-1-(Tetrahydro-pyran-2-yloxymethyl)-1,1a,6,6a-tetrahydro-cyclopropa[a]indene-6-carboxylic acid methyl ester