| 540 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6} |
| 200 | DF | .~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7} |
| 203 | DF | .~.~.~ Polycyclo ring system containing the hetero ring as one of the cyclos {4} |
| 205 | DF | .~.~.~.~ The ring nitrogen is shared by a six-membered ring {2} |
| 214 | DF | .~.~.~.~.~ The six-membered ring contains sulfur {1} |
| 215 |  | .~.~.~.~.~.~ 1-thia-5-aza-bicyclo(4.2.0)octane (including unsaturated; e.g., cepham, etc.) {9} |
| 216 | DF | .~.~.~.~.~.~.~> The 1-thia-5-aza-bicyclo(4.2.0)oct-ane is part of a polycyclo ring system having at least three cyclos |
| 217 | DF | .~.~.~.~.~.~.~> Double bond between the 2,3-positions of the bicyclo ring system (e.g., 2 cephem, etc.) |
| 218 | DF | .~.~.~.~.~.~.~> Ring expansion to produce the bicyclo ring system |
| 219 | DF | .~.~.~.~.~.~.~> 7-amino cephalosporanic acid per se or salt thereof (i.e., 7-ACA or salt thereof) |
| 220 | DF | .~.~.~.~.~.~.~> Purification or recovery |
| 221 | DF | .~.~.~.~.~.~.~> 7,7-disubstituted |
| 222 | DF | .~.~.~.~.~.~.~> Additional hetero ring containing {4} |
| 229 | DF | .~.~.~.~.~.~.~> Sulfur containing substituent |
| 230 | DF | .~.~.~.~.~.~.~> Alkyl, hydroxyalkyl, alkoxyalkyl or alkanoyloxyalkyl bonded directly to 3 position |