| 540 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6} |
| 484 | DF | .~.~ The hetero ring contains seven members including nitrogen and carbon {14} |
| 553 | DF | .~.~.~ The hetero ring contains plural nitrogens (e.g., 1,3-diazepines, etc.) {3} |
| 555 | DF | .~.~.~.~ Polycyclo ring system which contains the hetero ring as one of the cyclos {3} |
| 567 | DF | .~.~.~.~.~ Bicyclo ring system which contains the hetero ring as one of the cyclos {2} |
| 569 |  | .~.~.~.~.~.~ 1,4-benzodiazepines (including hydrogenated) {4} |
| 570 | DF | .~.~.~.~.~.~.~> Chalcogen bonded directly to ring carbon of the hetero ring |
| 571 | DF | .~.~.~.~.~.~.~> Nitrogen bonded directly to ring carbon of the hetero ring {1} |
| 573 | DF | .~.~.~.~.~.~.~> Chalcogen or nitrogen attached indirectly to ring carbon of the hetero ring by acyclic nonionic bonding |
| 574 | DF | .~.~.~.~.~.~.~> Formation of the 1,4-benzodiazepine ring system |