| 558 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {21} |
| 260 | DF | .~ Carbonate esters (i.e, compounds having the -O-C(=O)O- group bonded directly to at least one carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {8} |
| 270 |  | .~.~ Benzene ring bonded directly to the -O-C(=O)O- group {4} |
| 271 | DF | .~.~.~> Additional chalcogen bonded directly to the benzene ring |
| 272 | DF | .~.~.~> Nitrogen bonded directly to the benzene ring |
| 273 | DF | .~.~.~> Nitrogen or additional chalcogen attached indirectly to the benzene ring by acyclic nonionic bonding |
| 274 | DF | .~.~.~> Two benzene rings bonded directly to the -O-C(=O)O- group (i.e., diaryl carbonates) |