| 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} |
| 357 | DF | .~.~.~.~ Plural ring oxygens in the hetero ring (e.g., 1,2-dioxin, etc.) {4} |
| 358 | DF | .~.~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {2} |
| 359 |  | .~.~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {2} |
| 360 | DF | .~.~.~.~.~.~.~> Two of the cyclos share at least three ring members (i.e., bridged) |
| 361 | DF | .~.~.~.~.~.~.~> Three or more ring oxygens in the tricyclo ring system (e.g., actinospectacin, etc.) |