| 558 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {21} |
| 286 | DF | .~ Borate esters (i.e., compounds having boron and carbon each single bonded to the same oxygen, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {4} |
| 287 | DF | .~.~ Boron and oxygen in the same ring {1} |
| 288 | DF | .~.~.~ Carbon in the ring {3} |
| 291 | | .~.~.~.~ Three oxygens attached directly to the same boron by nonionic bonding |