trans-(2S,3S)-(-)-2,3-bis(toluene-p-sulfonyloxymethyl)-1,4,8,11-tetraoxacyclotetradecane
(2S,3S)-(-)-2,3-bis(benzyloxymethyl)-1,4,8,11-tetraoxacyclotetradecane
2-toluene-p-sulfonyloxymethyl-1,4,8,11-tetraoxacyclotetradecane
1,10-ditosyl-4,7-dioxadecane
3-<(benzyloxy)methyl>-15-crown-4