| 508 / | HD | SOLID ANTI-FRICTION DEVICES, MATERIALS THEREFOR, LUBRICANT OR SEPARATE COMPOSITIONS FOR MOVING SOLID SURFACES, AND MISCELLANEOUS MINERAL OIL COMPOSITIONS |
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| 110 | DF | LUBRICANTS OR SEPARANTS FOR MOVING SOLID SURFACES AND MISCELLANEOUS MINERAL OIL COMPOSITIONS (E.G., WATER CONTAINING, ETC.) {53} |
| 243 | DF | .~ Heterocyclic ring compound; a heterocyclic ring is one having as ring members only carbon and at least one hetero atom selected from nitrogen and chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) {4} |
| 299 |  | .~.~ Sulfur-containing hetero ring {3} |
| 300 | DF | .~.~.~> Plural hetero atoms in the hetero ring (e.g., 1,3-dithiane, etc.) |
| 301 | DF | .~.~.~> Polycyclo ring system which contains the hetero ring as one of the cyclos (e.g., benzothiophenes, etc.) |
| 302 | DF | .~.~.~> The hetero ring is five-membered {1} |