US PATENT SUBCLASS 552 / 256
.~.~.~.~ The additional carbon is part of a carbonyl group (i.e., carboxamido bonded directly at alpha position)


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

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
208  DF  .~ Polycyclo ring system containing anthracene configured ring system having at least one double bond between ring members and having oxygen single bonded or any atom double bonded directly at the 9- and 10-positions (e.g., anthraquinones, etc.) {19}
238  DF  .~.~ Nitrogen bonded directly at alpha position (i.e., 1-, 4-, 5- or 8-position) {7}
255  DF  .~.~.~ Additional carbon bonded directly to the nitrogen {3}
256.~.~.~.~ The additional carbon is part of a carbonyl group (i.e., carboxamido bonded directly at alpha position) {1}
257  DF  .~.~.~.~.~> Nitrogen, oxygen, sulfur or halogen bonded directly to an additional ring


DEFINITION

Classification: 552/256

(under subclass 255) Compounds wherein the additional carbon is part of a carbonyl group (i.e., -N - C-).

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