US PATENT SUBCLASS 552 / 203
.~.~.~ Nitrogen and carbonyl or cyano bonded directly to the tetracyclo ring system (e.g., tetracycline, etc.)

Current as of: June, 1999
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552 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, subclass 1) {11}
200  DF  .~ Tetracyclo naphthacene configured ring system having at least one double bond between ring members and having oxygen bonded directly to a carbon of an interior ring which carbon is a member of one ring only {2}
202  DF  .~.~ At least six oxygens bonded directly to the tetracyclo ring system {1}
203.~.~.~ Nitrogen and carbonyl or cyano bonded directly to the tetracyclo ring system (e.g., tetracycline, etc.) {3}
204  DF  .~.~.~.~> Carbon double bonded directly to the tetracyclo ring system (e.g., 6 methylene tetracycline, etc.)
205  DF  .~.~.~.~> Plural nitrogens bonded directly to the tetracyclo ring system
206  DF  .~.~.~.~> Processes {1}

DEFINITION

Classification: 552/203

(under subclass 202) Compounds wherein the tetracyclo ring system has nitrogen and either the cyano or carboxyl group bonded directly to the same ring, e.g., tetracycline, etc.

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