US PATENT SUBCLASS 548 / 339.1
.~.~.~.~.~.~ The nitrogen and -C(=X)X-, wherein X's are the same or diverse chalcogens, are bonded directly to the same acyclic carbon atom (e.g., -amino-4(5)- imidazole propionic acid or histidine, 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}
300.1  DF  .~.~.~ 1,3-diazoles (including hydrogenated) {9}
335.1  DF  .~.~.~.~ Two double bonds between ring members of the diazole ring (i.e., imidazole) {7}
335.5  DF  .~.~.~.~.~ Nitrogen attached indirectly to the diazole ring by acyclic nonionic bonding {4}
339.1.~.~.~.~.~.~ The nitrogen and -C(=X)X-, wherein X's are the same or diverse chalcogens, are bonded directly to the same acyclic carbon atom (e.g., -amino-4(5)- imidazole propionic acid or histidine, etc.) {1}
339.5  DF  .~.~.~.~.~.~.~> Halogen attached indirectly to the diazole ring by acyclic nonionic bonding

DEFINITION

Classification: 548/339.1

(under subclass 335.5) Compounds wherein a X- group, in which the X's are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium, or tellurium), and the nitrogen are bonded directly to the same acyclic carbon atom.

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