| 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} |
| 483 | DF | .~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring {5} |
| 484 |  | .~.~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens {2} |
| 485 | DF | .~.~.~.~.~.~> Plural -C(=X)X- groups bonded directly to the hetero ring |
| 486 | DF | .~.~.~.~.~.~> The carbon of the -C(=X)X- group is bonded directly at the 3-position of the hetero ring |