methyl 7-hydroxy-2-methoxy-8-oxo-6,8,9,10-tetrahydro-7H-7,9a-methanobenzo[a]azulene-1-carboxylate

Dimethyl 2-hydroxy-7-methoxy-1,2,3,4-tetrahydrofluorene-2,8-dicarboxylate

2-Hydroxy-7-methoxy-8-(methoxycarbonyl)-1,2,3,4-tetrahydrofluorene-2-carboxylic acid

(+/-)-Methyl 7-(chloroacetoxy)-2-methoxy-8-oxogibba-1,3,4a(10a),4b-tetraene-1-carboxylate

(+/-)-2-(Chloroacetoxy)-7-methoxy-8-(methoxycarbonyl)-1,2,3,4-tetrahydrofluorene-2-carboxylic acid