| 560 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES | 
| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {17} | 
| 301 |  | .~ Cyanate esters (i.e., compounds having the -OCN group bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) |