| 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} |
| 485 | DF | .~.~.~ Chalcogen double bonded directly to a ring carbon adjacent to the ring nitrogen (e.g., caprolactam, etc.) {15} |
| 492 | DF | .~.~.~.~ Plural nitrogens in the hetero ring {3} |
| 500 | DF | .~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {4} |
| 504 |  | .~.~.~.~.~.~ The bicyclo ring system is 1,4-benzodiazepine (including hydrogenated) {10} |
| 505 | DF | .~.~.~.~.~.~.~> The chalcogen double bonded directly to the hetero ring is sulfur |
| 506 | DF | .~.~.~.~.~.~.~> Additional chalcogen bonded directly to ring carbon of the hetero ring {1} |
| 509 | DF | .~.~.~.~.~.~.~> Acyclic nitrogen bonded directly to the hetero ring |
| 510 | DF | .~.~.~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring |
| 511 | DF | .~.~.~.~.~.~.~> Halogen bonded directly to the hetero ring |
| 512 | DF | .~.~.~.~.~.~.~> Chalcogen attached indirectly to nitrogen of the hetero ring by acyclic nonionic bonding |
| 513 | DF | .~.~.~.~.~.~.~> Sulfur, -C(=X)-, wherein X is chalcogen, or nitrogen, other than as nitro or nitroso, bonded directly to the carbocyclic ring of the bicyclo ring system |
| 514 | DF | .~.~.~.~.~.~.~> Nitrogen in the 1-position substituent of the bicyclo ring system |
| 515 | DF | .~.~.~.~.~.~.~> Preparation by cyclizing benzophenones or imine derivatives thereof |
| 516 | DF | .~.~.~.~.~.~.~> Preparation from a compound containing a different hetero ring |