TrimethylentrisulfidrThioformaldehyde trimersym-Trithianr1,3,5-Trithiacyclohexanr1,3,5-TrithianeTrimethylene trisulfidrTrithioformaldehydrs-TrithianeThioforr甲硫醛(三聚体)1,3,5-三噻烷sym.-Trithiane均-三噻烷1,3,5-Trithiane1,3,5-Trithianthioforms-trithianetrithioformaldehydesym-Trithian1,3,5-trithiacyclohexane1,3,5-trithianesym-trithianetrimethylene trisulfide