(6E)-6-[[2-[2-[2-[[(E)-(6-oxocyclohexa-2,4-dien-1-ylidene)methyl]amino]ethylsulfanyl]ethylsulfanyl]ethylamino]methylidene]cyclohexa-2,4-dien-1-one

2-N,2-N,3-N,3-N-tetramethyl-1,4,2,3-dithiadiborinane-2,3-diamine

ethyl 4,6,6-trimethyl-2-oxocyclohex-3-ene-1-carboxylate

ethyl 7,9,9-trimethyl-1,4-dithiospiro[4.5]dec-6-ene-8-carboxylate

ethyl spiro[1,2,3,4,5,6-hexahydronaphthalene-7,2'-1,3-dithiolane]-4a-carboxylate