| 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} |
| 218 |  | .~.~.~ Phosphorus attached indirectly to the hetero ring by nonionic bonding {4} |
| 219 | DF | .~.~.~.~> Oxirane ring containing |
| 220 | DF | .~.~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos |
| 221 | DF | .~.~.~.~> Plural ring oxygens in the hetero ring |
| 222 | DF | .~.~.~.~> Chalcogen bonded directly to the hetero ring |