3, 4, 6-Trichloropyridazine

3, 4, 6-Trichloroveratrole

3, 4, 7, 12-Tetrahydroxy-9, 10-seco-1, 3, 5(10)-androstatriene-9, 17-dione

3, 4, 7, 8, 11, 12-Hexabromocyclododeca-1, 5, 9-triene

3, 4, 7, 8, 9, 10-Hexahydro-5, 7, 7, 8, 10, 10-hexamethyl-1H-naphtho(1, 2-c)pyran

3, 4, 7, 8-Tetramethyl-1, 10-phenanthroline

3, 4, 7, 8-Tetramethyl-1, 10-phenanthroline ferrous sulfate

3, 4, 7, 8-Tetraphenyl-1, 2, 5, 6-tetraazocine

3, 4, 7-Trichlorodibenzofuran

3, 4, 7-Trihydroxycholanoic acid

3, 4, 7-Trimethyl-1-indanone

3, 4, 7a-Triazacyclohepta(j, k)fluorene, 1, 2, 4, 5, 6, 7-hexahydro-2, 4-dimethyl-

3, 4, 8, 8a-Tetrahydro-8a-methyl-(2H, 7H)naphthalene-1, 6-dione

3, 4, 8-Triazatetracyclo(4.3.1.02, 5.07, 9)dec-3-ene, 8-(4-chlorophenyl)-, (1R, 2R, 5S, 6S, 7R, 9S)-rel-

3, 4, 8-Trimethyl-2-nitro-3H-imidazo(4, 5-f)quinoxaline

3, 4, 8-Trimethylimidazo(4, 5-f)quinoxalin-2-amine

3, 4, 9, 10-Perylenetetracarboxylic acid

3, 4-(Dichloro)-5-hydroxy-2(5H)-furanone

3, 4-(Methylenedioxy)phenylacetonitrile

3, 4-10, 11-12, 13-Tribenzofluoranthene