Patent ID: 7285556

Claim:
A compound of the formula: or a pharmaceutically acceptable salt thereof wherein: R 4 =H, alkyl, a halogen, aromatic ring, non-aromatic ring, heterocyclic aromatic ring, heterocyclic non-aromatic ring, a hydrogen bond donor or a hydrogen bond acceptor; R 5 =H, alkyl, a halogen, aromatic ring, non-aromatic ring, heterocyclic aromatic ring, heterocyclic non-aromatic ring, a hydrogen bond donor or a hydrogen bond acceptor; R 6 =H or alkyl; R 7 =H or alkyl; and R 8 =a H, alkyl, a halogen, aromatic ring, non-aromatic ring, heterocyclic aromatic ring, heterocyclic non-aromatic ring, a hydrogen bond donor or a hydrogen bond acceptor, except that when the compound is of formula: and when R 8 is a substituted or unsubstituted phenyl group or a furanyl group, then R 5 can not be phenyl if R 4 is H.