| 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 |  | .~.~ 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} |
| 541 | DF | .~.~.~> Heavy metal or boron containing |
| 542 | DF | .~.~.~> Phosphorus attached directly or indirectly to the hetero ring by nonionic bonding |
| 543 | DF | .~.~.~> Spiro |
| 544 | DF | .~.~.~> The hetero ring contains chalcogen {2} |
| 553 | DF | .~.~.~> The hetero ring contains plural nitrogens (e.g., 1,3-diazepines, etc.) {3} |
| 576 | DF | .~.~.~> Polycyclo ring system which contains the hetero ring as one of the cyclos {4} |
| 596 | DF | .~.~.~> Additional hetero ring attached directly or indirectly to the hetero ring by nonionic bonding {2} |
| 604 | DF | .~.~.~> Chalcogen attached directly to the hetero ring by nonionic bonding |
| 605 | DF | .~.~.~> Nitrogen attached directly to the hetero ring by nonionic bonding {1} |
| 607 | DF | .~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to nitrogen of the hetero ring {1} |
| 609 | DF | .~.~.~> Chalcogen or nitrogen attached indirectly to the hetero ring by acyclic nonionic bonding {1} |
| 611 | DF | .~.~.~> Benzene ring bonded directly to the hetero ring |
| 612 | DF | .~.~.~> The hetero ring is unsubstituted or alkyl substituted only |