US PATENT SUBCLASS 548 / 372.5
.~.~.~.~.~ Chalcogen attached indirectly to the diazole ring by acyclic nonionic bonding [e.g., 1-(2-hydroxyethyl)-3-amino-4(para-chlorophenyl)-pyrazole, etc.]

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548 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
100  DF  .~.~ Hetero ring is five-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazoles, etc.) {18}
356.1  DF  .~.~.~ 1,2-diazoles (including hydrogenated) {8}
371.4  DF  .~.~.~.~ Nitrogen attached directly to the diazole ring by nonionic bonding {3}
372.5.~.~.~.~.~ Chalcogen attached indirectly to the diazole ring by acyclic nonionic bonding [e.g., 1-(2-hydroxyethyl)-3-amino-4(para-chlorophenyl)-pyrazole, etc.]

DEFINITION

Classification: 548/372.5

(under subclass 371.4) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached

indirectly to the diazole ring by acyclic nonionic bonding.

(1) Note. This subclass contains, for example: [figure] [figure]