Patent ID: 8222290

Claim:
A compound of formula (I): wherein R, R 1 , R 2 and R 3 are the same or different and independently of each other chosen from hydrogen, (C 1 -C 4 )alkyl or CF 3 ; R 4 and R 5 are the same or different and independently of each other selected from the group consisting of hydrogen, n-hexyl, phenyl, benzyl, cyclohexyl, cyclohexylmethyl and thiophen-2-ylmethyl; wherein said R 4 and R 5 are optionally substituted one or more times with a substituent selected from halogen or CN; provided that both R 4 and R 5 are not simultaneously hydrogen; or R 4 and R 5 taken together with the nitrogen atom to which they are attached form a heterocyclic ring selected from the group consisting of pyrrolidine, piperidine, piperazine, morpholine, and 1,3-dihydro-isoindolyl, wherein said heterocyclic ring is optionally substituted one or more times with a substituent selected from the group consisting of methyl, ethyl, phenyl, N-acetyl and N-acetyl-methylamino; or a pharmaceutically acceptable salt thereof or an enantiomer or a diastereomer thereof.