| 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} |
| 356 |  | .~.~.~ The hetero ring is six-membered {9} |
| 357 | DF | .~.~.~.~> Plural ring oxygens in the hetero ring (e.g., 1,2-dioxin, etc.) {4} |
| 381 | DF | .~.~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos {4} |
| 414 | DF | .~.~.~.~> Plural hetero rings {1} |
| 416 | DF | .~.~.~.~> Chalcogen bonded directly to the hetero ring {6} |
| 424 | DF | .~.~.~.~> Nitrogen bonded directly to the hetero ring |
| 425 | DF | .~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring |
| 426 | DF | .~.~.~.~> Nitrogen attached indirectly to the hetero ring by nonionic bonding |
| 427 | DF | .~.~.~.~> Chalcogen attached indirectly to the hetero ring by nonionic bonding |
| 428 | DF | .~.~.~.~> Halogen attached directly or indirectly to the hetero ring by nonionic bonding |