| 423 / | HD | CHEMISTRY OF INORGANIC COMPOUNDS |
| 351 | DF | NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID) {5} |
| 364 | DF | .~ Carbon containing {7} |
| 371 | DF | .~.~ Ternary compound {4} |
| 372 | DF | .~.~.~ Hydrogen cyanide {4} |
| 375 | | .~.~.~.~ Employing ammonia as reactant {1} |
| 376 | DF | .~.~.~.~.~> And using catalyst |