(1R,1aS,6R,6aR)-1-Hydroxymethyl-1,1a,6,6a-tetrahydro-cyclopropa[a]indene-6-carboxylic acid

6-exo-methyl-4-oxa-7,8-benzotricyclo<4.3.0.02,9>non-7-en-5-one

4-oxa-7,8-benzotricyclo<4.3.0.02,9>non-7-en-5-one

methyl 6-endo-(hydroxymethyl)-3,4-benzobicyclo<3.1.0>hex-3-ene-2-exo-carboxylate

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