| 504 / | HD | PLANT PROTECTING AND REGULATING COMPOSITIONS |
| 116 | DF | PLANT GROWTH REGULATING COMPOSITIONS (E.G., HERBICIDES, ETC.) {9} |
| 189 | DF | .~ Organic active compound containing {19} |
| 209 | DF | .~.~ Hetero ring containing {11} |
| 235 | DF | .~.~.~ Hetero ring is six-membered consisting of two nitrogens and four carbons (e.g., 1,4-diazines, etc.) {2} |
| 236 | DF | .~.~.~.~ 1,2-diazines (including hydrogenated) {2} |
| 237 | | .~.~.~.~.~ Nitrogen attached directly to the diazine ring by nonionic bonding |