a naphthalene ring system which may be substituted with up to 2 substituents each substituent is independently selected from the group consisting of halogen nitrile hydroxy c 1 u2013 c 4 alkyl c 1 u2013 c 4 alkoxy c 1 u2013 c 2 alkyl substituted with one or more halogens c 1 u2013 c 2 alkoxy substituted with one or more halogens sr 4 and nr 4 r 5 these substituents may be located at any of positions 2 thru 8 on the naphthalene ring position 1 of the naphthelene ring is the point of attachment to the rest of the compound o u201c heteroaryl u201d refers to aromatic ring having one or more heteroatoms selected from oxygen nitrogen and sulfur more specifically it refers to a 5 or 6 membered ring containing 1 2 or 3 nitrogen atoms 1 oxygen atom 1 sulfur atom 1 nitrogen and 1 sulfur atom 1 nitrogen and 1 oxygen atom 2 nitrogen atoms and 1 oxygen atom or 2 nitrogen atoms and 1 sulfur atom the 5 membered ring has 2 double bonds and the 6 membered ring has 3 double bonds the term heteroaryl also includes bicyclic groups in which the heteroaryl ring is fused to a benzene ring heterocyclic ring a cycloalkyl ring or another heteroaryl ring examples of such heteroaryl ring systems include but is not limited to pyrrolyl furanyl thienyl imidazolyl oxazolyl indolyl thiazolyl pyrazolyl pyridinyl pyrimidinyl purinyl quinolinyl isoquinolinyl p u201c optionally substituted heteroaryl u201d refers to a heteroaryl moiety as defined immediately.