(E)-1-ethyl 7-methyl 4-(4-chlorobenzylthio)hept-2-enedioate
(E)-1-ethyl 7-methyl 4-(benzylthio)hept-2-enedioate
(R,E)-1-ethyl 7-methyl 4-(4-methoxybenzylthio)hept-2-enedioate
(E)-1-ethyl 7-methyl 4-(2-bromobenzylthio)hept-2-enedioate
(E)-1-ethyl 7-methyl 4-(phenethylthio)hept-2-enedioate