| abstract |
The invention relates to the novel materials of formula (I), where R 1 is an optionally substituted L-aryl or -heteroaryl, such that L is: an alkyl or CO, or L X, with L being an alkyl and X being O or S; R 2 is H or an alkyl; R 3 is an alkyl optionally substituted by Hal; and R 4 is Hou Hal, wherein said materials are in any isomeric form and the salts thereof, to be used as drugs. |