| 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 | DF | .~.~.~.~ Plural ring oxygens in the hetero ring {8} |
| 432 | DF | .~.~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {2} |
| 434 |  | .~.~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {6} |
| 435 | DF | .~.~.~.~.~.~.~> Plural hetero rings |
| 436 | DF | .~.~.~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the bicyclo ring system |
| 437 | DF | .~.~.~.~.~.~.~> Acyclic chalcogen bonded directly to the bicyclo ring system {1} |
| 439 | DF | .~.~.~.~.~.~.~> Nitrogen bonded directly to the bicyclo ring system |
| 440 | DF | .~.~.~.~.~.~.~> Nitrogen attached indirectly to the bicyclo ring system by nonionic bonding {3} |
| 445 | DF | .~.~.~.~.~.~.~> Chalcogen attached indirectly to the ring system by nonionic bonding {1} |