| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 511 | DF | SULFUR OR COMPOUND THEREOF {4} |
| 512.1 | | .~ Oxygen containing {11} |
| 513 | DF | .~.~> Persulfate |
| 514 | DF | .~.~> Thiosulfate |
| 515 | DF | .~.~> Dithionite {1} |
| 517 | DF | .~.~> Metal and ammonium containing |
| 518 | DF | .~.~> Plural metal containing |
| 519 | DF | .~.~> Bisulfite |
| 519.2 | DF | .~.~> Sulfite {1} |
| 521 | DF | .~.~> Ternary compound containing hydrogen {1} |
| 532 | DF | .~.~> Sulfur trioxide {1} |
| 539 | DF | .~.~> Sulfur dioxide {4} |
| 544 | DF | .~.~> Sulfate {7} |