Patent ID: 8017771

Claim:
A compound of formula 4 or formula 6: wherein Het is a five-, six- or seven-membered saturated or unsaturated heterocycle containing from one to four heteroatoms selected from nitrogen, oxygen and sulfur; said heterocycle being substituted with R 1 at any available position on the heterocycle; R 1 is R 20 , —NR 22 COR 20 , —NR 22 COOR 20 —NR 22 R 21 and —NR 22 CONR 21 R 23 , wherein R 20 is selected from (C 1-8 )alkyl, (C 3-7 )cycloalkyl and (C 3-7 )cycloalkyl(C 1-4 )alkyl-, wherein said cycloalkyl or cycloalkylalkyl may be mono-, di- or tri-substituted with (C 1-3 )alkyl; R 21 is H or has one of the meanings of R 20 as defined above, R 22 and R 23 are independently selected from H and methyl, each Alk is independently a C 1 -C 6 alkyl group.