US PATENT SUBCLASS 504 / 220
.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to ring nitrogen of the hetero ring

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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}
218  DF  .~.~.~ Hetero ring contains at least seven members including nitrogen {2}
220.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to ring nitrogen of the hetero ring

DEFINITION

Classification: 504/220

Having -C(=X)-, wherein X is chalcogen, bonded directly to ring nitrogen of the hetero ring:

(under subclass 218) Compositions in which -C(=X)-, wherein X is chalcogen (i.e., oxygen, sulfur, selenium, or tellurium), is bonded directly to a ring nitrogen.