| 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} |
| 456 | DF | .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {3} |
| 462 |  | .~.~.~.~.~ Bicyclo ring system having the hetero ring as one of the cyclos {9} |
| 463 | DF | .~.~.~.~.~.~> The two cyclos share at least three ring members (i.e., bridged) |
| 464 | DF | .~.~.~.~.~.~> Plural ring oxygens in the bicyclo ring system |
| 465 | DF | .~.~.~.~.~.~> The bicyclo ring system consists of two five-membered cyclos |
| 466 | DF | .~.~.~.~.~.~> Acyclic chalcogen bonded directly to the hetero ring |
| 467 | DF | .~.~.~.~.~.~> Nitrogen attached directly or indirectly to the hetero ring by acyclic nonionic bonding |
| 468 | DF | .~.~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring |
| 469 | DF | .~.~.~.~.~.~> Benzene ring bonded directly to the hetero ring |
| 470 | DF | .~.~.~.~.~.~> Chalcogen of -C(=X)X-, wherein the X's are the same or diverse chalcogens, bonded directly to the carbocyclic ring of the bicyclo ring system |
| 471 | DF | .~.~.~.~.~.~> Plural double bonds between ring members of the hetero ring |