| 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} |
| 336 | DF | .~.~.~.~ 1,4-diazines {9} |
| 358 |  | .~.~.~.~.~ Piperazines (i.e., fully hydrogenated 1,4-diazines) {12} |
| 359 | DF | .~.~.~.~.~.~> Additional hetero ring containing {4} |
| 380 | DF | .~.~.~.~.~.~> Polycyclo-carbocyclic ring system having at least three cyclos {1} |
| 382 | DF | .~.~.~.~.~.~> Nitrogen attached directly to the piperazine ring by nonionic bonding |
| 383 | DF | .~.~.~.~.~.~> Chalcogen attached directly to piperazine ring nitrogen by nonionic bonding |
| 384 | DF | .~.~.~.~.~.~> Chalcogen bonded directly to piperazine ring carbon {1} |
| 386 | DF | .~.~.~.~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the piperazine ring {4} |
| 392 | DF | .~.~.~.~.~.~> Phenyl or naphthyl bonded directly to ring nitrogen of the piperazine ring {3} |
| 396 | DF | .~.~.~.~.~.~> Plural carbocyclic rings bonded directly to the same acyclic carbon {1} |
| 398 | DF | .~.~.~.~.~.~> Chalcogen attached indirectly to the piperazine ring by nonionic bonding {2} |
| 402 | DF | .~.~.~.~.~.~> Nitrogen attached indirectly to the piperazine ring by nonionic bonding |
| 403 | DF | .~.~.~.~.~.~> Carbocyclic ring containing |
| 404 | DF | .~.~.~.~.~.~> N-hydrocarbyl piperazines |