| 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 | | .~.~.~ Hydrogen cyanide {4} |
| 373 | DF | .~.~.~.~> Employing formamide or formate as reactant |
| 374 | DF | .~.~.~.~> Utilizing nitric oxide or free nitrogen as reactant |
| 375 | DF | .~.~.~.~> Employing ammonia as reactant {1} |
| 377 | DF | .~.~.~.~> Utilizing metal cyanide as reactant |