US PATENT SUBCLASS 544 / 74
.~.~.~.~.~.~ Plural 1,4-oxazine rings are cyclos in the polycyclo ring system


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544 /   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) {1}
1  DF  .~.~ Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) {6}
63  DF  .~.~.~ Six-membered hetero ring consists of oxygen, nitrogen and carbon (e.g., 1,2-oxazines, etc) {8}
72  DF  .~.~.~.~ Plural oxazine rings {2}
73  DF  .~.~.~.~.~ Polycyclo ring system having oxazine ring as at least one of the cyclos {1}
74.~.~.~.~.~.~ Plural 1,4-oxazine rings are cyclos in the polycyclo ring system {1}
75  DF  .~.~.~.~.~.~.~> Pentacyclo ring system having the oxazine rings as cyclos {1}


DEFINITION

Classification: 544/74

(under subclass 73) Compounds wherein the polycyclo ring system contains at least two of the six-membered hetero rings, each having its oxygen in the 1-position and its nitrogen in the 4-position.