| 544 / | 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) {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} |
| 262 | DF | .~.~.~.~.~.~.~.~.~ The other cyclo in the bicyclo ring system is five-membered {2} |
| 264 | DF | .~.~.~.~.~.~.~.~.~.~ Purines (including hydrogenated) {2} |
| 265 | DF | .~.~.~.~.~.~.~.~.~.~.~ Chalcogen bonded directly to ring carbon of the purine ring system {3} |
| 267 |  | .~.~.~.~.~.~.~.~.~.~.~.~ At 2- and 6-positions (e.g., theophyllines, etc.) {6} |
| 268 | DF | .~.~.~.~.~.~.~>.~.~.~.~.~.~ Additional polycyclo ring system, which is not **another purine, having a hetero ring as one of the **cyclos |
| 269 | DF | .~.~.~.~.~.~.~>.~.~.~.~.~.~ Additional hetero ring which is unsaturated and is **not one of the cyclos of a purine ring system {1} |
| 271 | DF | .~.~.~.~.~.~.~>.~.~.~.~.~.~ Having -C(=X)-, wherein X is chalcogen attached **directly or indirectly to the purine ring system by **nonionic bonding or halogen bonded directly at **8-position (e.g., theophylline acetate, **8-chlorotheophylline, etc.) |
| 272 | DF | .~.~.~.~.~.~.~>.~.~.~.~.~.~ Nitrogen attached directly or indirectly to the **purine ring system by nonionc bonding |
| 273 | DF | .~.~.~.~.~.~.~>.~.~.~.~.~.~ Positions other than 2- and 6- are unsubstituted or **hydrocarbyl or hydro- carboyl substituted only **(e.g., theophylline, etc.) |
| 274 | DF | .~.~.~.~.~.~.~>.~.~.~.~.~.~ Caffeine per se, theobromine per se, or salt **thereof {1} |