US PATENT SUBCLASS 544 / 72
.~.~.~.~ Plural oxazine rings


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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.~.~.~.~ Plural oxazine rings {2}
73  DF  .~.~.~.~.~> Polycyclo ring system having oxazine ring as at least one of the cyclos {1}
78  DF  .~.~.~.~.~> Plural morpholine rings (i.e., plural fully hydrogenated 1, 4-oxazine rings) {6}


DEFINITION

Classification: 544/72

(under subclass 63) Compounds having at least two six-membered hetero rings each consisting of one ring oxygen, one ring nitrogen and four ring carbons.