| 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 | DF | .~.~.~ The hetero ring is six-membered {9} |
| 416 |  | .~.~.~.~ Chalcogen bonded directly to the hetero ring {6} |
| 417 | DF | .~.~.~.~.~> Plural chalcogens bonded directly to the hetero ring {1} |
| 419 | DF | .~.~.~.~.~> Nitrogen attached directly or indirectly to the hetero ring by acyclic nonionic bonding |
| 420 | DF | .~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, attached directly or indirectly to the hetero ring by acyclic nonionic bonding |
| 421 | DF | .~.~.~.~.~> Alicyclic ring bonded directly to the chalcogen |
| 422 | DF | .~.~.~.~.~> Five-membered carbocyclic ring having the hetero ring as part of one substituent and -COO- as part of another substituent (e.g., prostaglandin intermediates, etc.) |
| 423 | DF | .~.~.~.~.~> Hydroxy or halogen attached directly or indirectly to the hetero ring by acyclic nonionic bonding (H of -OH may be replaced by a substituted or unsubstituted ammonium ion or a Group IA or IIA light metal) |