7-(2-Chloro-acetoxy)-7-chlorocarbonyl-2-methoxy-6,7,8,9-tetrahydro-5H-fluorene-1-carboxylic acid methyl ester

(+/-)-2-(Dichloroacetoxy)-7-methoxy-1,2,3,4-tetrahydro-8-(methoxycarbonyl)fluorene-2-carboxylic acid