US PATENT SUBCLASS 514 / 285
.~.~.~.~.~ Plural hetero atoms in the tetracyclo ring system (e.g., acronycines, etc.)

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514 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

1  DF  DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29}
183  DF  .~ Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., O,S,Se or Te) or nitrogen as the only ring hetero atoms DOAI {16}
277  DF  .~.~ Hetero ring is six-membered consisting of one nitrogen and five carbon atoms {11}
279  DF  .~.~.~ Polycyclo ring system having the six-membered hetero ring as one of the cyclos {4}
284  DF  .~.~.~.~ Tetracyclo ring system having the six-membered hetero ring as one of the cyclos {2}
285.~.~.~.~.~ Plural hetero atoms in the tetracyclo ring system (e.g., acronycines, etc.) {3}
286  DF  .~.~.~.~.~.~> Two of the cyclos share at least three ring members (i.e., bridged)
287  DF  .~.~.~.~.~.~> Three or more hetero atoms in the tetracyclo ring system
288  DF  .~.~.~.~.~.~> Ring carbon is shared by three of the cyclos

DEFINITION

Classification: 514/285

Plural hetero atoms in the tetracyclo ring system (e.g., acronycines, etc.):

(under subclass 284) Subject matter wherein the tetracyclo ring system contains at least one ring hetero atom in addition to the ring nitrogen of the six-membered hetero ring.