| 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} |
| 201 |  | .~.~.~ With preservative or stabilizer {4} |
| 202 | DF | .~.~.~.~> Oxirane containing compound with preservative or stabilizer |
| 203 | DF | .~.~.~.~> Cyclic anhydride containing compound with preservative or stabilizer |
| 204 | DF | .~.~.~.~> Lactone containing compound with preservative or stabilizer |
| 205 | DF | .~.~.~.~> Compound in which the hetero ring is five-membered with preservative or stabilizer |