US PATENT SUBCLASS 548 / 532
.~.~.~.~.~ And is bonded directly to a ring carbon which is adjacent to the ring nitrogen of the five-membered hetero ring (e.g., 4-hydroxy proline, 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}
400  DF  .~.~ Hetero ring is five-membered consisting of one nitrogen and four carbons (e.g., halopyrrolidines, etc.) {20}
530  DF  .~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the five membered hetero ring (e.g., pyrrole carbonyl halides, pyrrole carboxaldehyde, etc.) {4}
531  DF  .~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens (e.g., pyrrole-3-carboxylic acid, etc.) {2}
532.~.~.~.~.~ And is bonded directly to a ring carbon which is adjacent to the ring nitrogen of the five-membered hetero ring (e.g., 4-hydroxy proline, etc.) {3}
533  DF  .~.~.~.~.~.~> Additional -C(=X) bonded directly to the five-membered hetero ring (e.g., N n-butyryl-L-proline, etc.)
534  DF  .~.~.~.~.~.~> Chalcogen bonded directly to the other ring carbon which is adjacent to the ring nitrogen of the five-membered hetero ring (e.g., 2-pyrrolidone-5 carboxylic acid, etc.)
535  DF  .~.~.~.~.~.~> The five-membered hetero ring is further unsubstituted or alkyl substituted only (e.g., proline, etc.)

DEFINITION

Classification: 548/532

(under subclass 531) Compounds wherein the X group is bonded directly to a ring carbon of the five-membered hetero ring which is adjacent to the ring nitrogen.

(1) Note. An example of a compound provided for herein is: [figure]