| 549 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| * | DD | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2} |
| 200 | DF | .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16} |
| 429 | DF | .~.~.~ The hetero ring is five-membered {14} |
| 430 |  | .~.~.~.~ Plural ring oxygens in the hetero ring {8} |
| 431 | DF | .~.~.~.~.~> Three or more ring oxygens in the hetero ring (e.g., ozonides, etc.) |
| 432 | DF | .~.~.~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos {2} |
| 448 | DF | .~.~.~.~.~> Plural hetero rings |
| 449 | DF | .~.~.~.~.~> Nitrogen or chalcogen bonded directly to the hetero ring |
| 450 | DF | .~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring |
| 451 | DF | .~.~.~.~.~> Nitrogen attached indirectly to the hetero ring by nonionic bonding {1} |
| 453 | DF | .~.~.~.~.~> Chalcogen attached indirectly to the hetero ring by nonionic bonding {1} |
| 455 | DF | .~.~.~.~.~> Halogen attached directly or indirectly to the hetero ring by nonionic bonding |