19,21-dioxa-2,11-dithia[3.3.3](1,2,3)cyclophane

biphenyl-2,6-diyldi-acetic acid diethyl ester

(2-hydroxy-2-phenyl-cyclohexane-1,3-diyl)-di-acetic acid diethyl ester

2-ethyl-3',4'-dihydro-spiro[cyclopentane-1,2'-naphthalen]-1'-one

2-ethyl-1-phenethyl-cyclopentanecarboxylic acid