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} |
373 | .~.~.~.~ Employing formamide or formate as reactant |