| 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} |
| 100 | DF | .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18} |
| 112 |  | .~.~.~ Phosphorus attached indirectly to the five-membered hetero ring by nonionic bonding {4} |
| 113 | DF | .~.~.~.~> Polycyclo ring system having the five-membered hetero ring as one of the cyclos {1} |
| 115 | DF | .~.~.~.~> The five-membered hetero ring and phosphorus are both bonded directly to the same nitrogen |
| 116 | DF | .~.~.~.~> The five-membered hetero ring and phosphorus are both bonded directly to the same chalcogen {2} |
| 119 | DF | .~.~.~.~> The phosphorus is part of a substituent which is attached directly to ring carbon of the five-membered hetero ring |