US PATENT SUBCLASS 549 / 226
.~.~.~.~.~ Plural nitrogens bonded directly to the xanthene ring system (e.g., 2,6 diaminofluorans, etc.)

Current as of: June, 1999
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549 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  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.~.~.~.~.~ Plural nitrogens bonded directly to the xanthene ring system (e.g., 2,6 diaminofluorans, etc.) {1}
227  DF  .~.~.~.~.~.~> Rhodamines

DEFINITION

Classification: 549/226

(under subclass 225) Compounds in which at least two nitrogens are bonded directly to the xanthene ring system.

(1) Note. An example of a compound provided for herein is: [figure]