| 548 / | 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) {4} |
| 954 |  | .~.~ Hetero ring is three-membered including nitrogen and carbon {11} |
| 955 | DF | .~.~.~> Heavy metal, boron or silicon containing |
| 956 | DF | .~.~.~> Phosphorus attached directly or indirectly to the hetero ring by nonionic bonding {1} |
| 958 | DF | .~.~.~> Spiro |
| 959 | DF | .~.~.~> Plural hetero atoms in the hetero ring {1} |
| 961 | DF | .~.~.~> Polycyclo ring system having the hetero ring as one of the cyclos |
| 962 | DF | .~.~.~> Additional hetero ring containing {2} |
| 965 | DF | .~.~.~> Chalcogen, nitrogen or halogen attached directly to the hetero ring by nonionic bonding |
| 966 | DF | .~.~.~> Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring |
| 967 | DF | .~.~.~> Nitrogen, other than as nitro or nitroso, attached indirectly to the hetero ring by nonionic bonding |
| 968 | DF | .~.~.~> Chalcogen attached indirectly to the hetero ring by nonionic bonding |
| 969 | DF | .~.~.~> The three-membered hetero ring is unsubstituted or alkyl substituted only |