US PATENT SUBCLASS 544 / 257
.~.~.~.~.~.~.~.~.~ Pteridines (including hydrogenated)

Current as of: June, 1999
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544 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
224  DF  .~.~.~ The six-membered hetero ring consists of two nitrogens and four carbons (e.g., 1,2-diazines, etc.) {9}
242  DF  .~.~.~.~ 1,3-diazines {10}
245  DF  .~.~.~.~.~ Polycyclo ring system having the diazine ring as one of the cyclos {3}
253  DF  .~.~.~.~.~.~ Bicyclo ring system having the diazine ring as one of the cyclos {5}
255  DF  .~.~.~.~.~.~.~ Four ring hetero atoms in the bicyclo ring system {1}
256  DF  .~.~.~.~.~.~.~.~ Four ring nitrogens in the bicyclo ring system {2}
257.~.~.~.~.~.~.~.~.~ Pteridines (including hydrogenated) {1}
258  DF  .~.~.~.~.~.~.~>.~.~.~ Nitrogen bonded directly to the pteridine ring system {2}

DEFINITION

Classification: 544/257

Pterdines (including hydrogenated):

(under subclass 256) Compounds wherein the bicyclo ring system has the following basic structure in which the bonds between ring members may be single or double bonds.: [figure]

(1) Note. The following shows the position numbering used for pteridines: [figure] [figure]