| 552 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
| * | DD | ORGANIC COMPOUNDS (Class 532, subclass 1) {11} |
| 271 | DF | .~ Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded direct at the 9- or 10-position (e.g., anthrones, anthranois, etc.) {10} |
| 282 | DF | .~.~ The polycyclo ring system has seven or eight cyclos {1} |
| 283 | | .~.~.~ Halogen containing |