Single N As Only Hetero Atom In Ring (9/553; 9/568) Patents (Class 987/90)

Seven or more atoms in ring containing the single n atom (9/553a7) (Class 987/91)

Six atoms in ring containing the single n atom (9/576) (Class 987/92)

Ring is condensed or bridged to a carbocyclic ring system (9/576V) (Class 987/97)
N of ring is bonded directly to a P atom or is indirectly bonded to a P atom other than through a ring atom of the hydrogenated pyridine ring (9/59E) (Class 987/98)

Pyridine ring (9/58; 9/58G; 9/58R) (Class 987/99)

Five-membered ring containing a single n atom (9/572; 9/572g; 9/572k; 9/572k2; 9/572k4; 9/572r) (Class 987/103)

Four-membered ring containing a single n atom is condensed or bridged to a carbocyclic ring system (9/568v) (Class 987/106)

N atom of four-membered ring containing a single n atom is bonded directly to a p atom or indirectly to a p atom other than through a ring atom of the four-membered ring (9/568e) (Class 987/107)

Three-membered ring containing a single n atom (9/564) (Class 987/108)

There are no patents to show for this class.