| 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} |
| 223 | DF | .~.~.~ Xanthene ring system having a benzene ring bonded directly thereto para to the xanthene ring oxygen, wherein the carbon of a -COO- group is bonded directly to the benzene ring ortho to its position of attachment to the xanthene ring system, and spirolactone derivatives thereof (e.g., fluoresceins, chlorofluorans, etc.) {2} |
| 225 | DF | .~.~.~.~ Nitrogen bonded directly to the xanthene ring system (e.g., rhodols, aminofluorans, etc.) {1} |
| 226 | DF | .~.~.~.~.~ Plural nitrogens bonded directly to the xanthene ring system (e.g., 2,6 diaminofluorans, etc.) {1} |
| 227 |  | .~.~.~.~.~.~ Rhodamines |